Properties of the Number 3988

Three Thousand Nine Hundred Eighty-Eight

Basics

Value: 3987 → 3988 → 3989

Parity: even

Prime: No

Previous Prime: 3967

Next Prime: 3989

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 2 ² × 997

Divisors: 1, 2, 4, 997, 1994, 3988

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111110010100

Octal: 7624

Duodecimal: 2384

Hexadecimal: f94

Square: 15904144

Square Root: 63.150613615387776

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Number of non-quanimous subsets of {1..n}, meaning there is only one set partition with all equal block-sums. A371789

Triangle read by rows: T(m,n) = ∑_{-m<i<m, -n<j<n, gcd{i,j}=1} (m-|i|)*(n-|j|), m >= n >= 1. A332350

Number of one-element transitions from the partitions of n to the partitions of n+1 for labeled parts. A93694

Numbers k such that φ(k) = φ(k+4), with Euler's totient function φ = A000010. A179186

T(n,k)=Half the number of (n+2)X(k+2) binary arrays with each 3X3 subblock having sum 4 or 5. A186825

Positive discriminants of orders of quadratic fields with form class number 3. A391425

Coefficients of the '6th-order' mock θ function λ(q). A53272

Sum of digits = 7 times number of digits. A61424

Number n for which φ(n) = φ(n'), where φ is the Euler totient function and n' the arithmetic derivative of n. A190402

Numbers that are the sum of eight fourth powers in three or more ways. A345578