Properties of the Number 1856

One Thousand Eight Hundred Fifty-Six

Basics

Value: 1855 → 1856 → 1857

Parity: even

Prime: No

Previous Prime: 1847

Next Prime: 1861

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 2 ⁶ × 29

Divisors: 1, 2, 4, 8, 16, 29, 32, 58, 64, 116

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 11101000000

Octal: 3500

Duodecimal: 10A8

Hexadecimal: 740

Square: 3444736

Square Root: 43.08131845707603

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

The "comma sequence": the lexicographically earliest sequence of positive numbers with the property that the sequence formed by the pairs of digits adjacent to the commas between the terms is the same as the sequence of successive differences between the terms. A121805

Numbers that are divisible by exactly 7 primes counting multiplicity. A46308

Partial sums of A299257. A299263

a(n) = 2·a(n-1) + 4·a(n-2), a(0)=1, a(1)=1. A84057

Snowflake (or E-toothpick) sequence (see Comments lines for definition). A161330

Number of reducible integer partitions of n. A305563

Inverse binomial matrix applied to A110877. A126093

Numbers n such that 3ⁿ + 2^n-1 is prime. A82103

Years in which there are five Fridays in the month of February. A141287

Minimal (positive) solution a(n) of Pell equation b(n)² - D(n)*a(n)² = +4 with D(n)= A077425(n). The companion sequence is a(n)=A077428(n). A78355