13855831 has 12 divisors (see below), whose sum is σ = 15320536. Its totient is φ = 12521520.

The previous prime is 13855819. The next prime is 13855837.

13855831 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 13855831 - 2⁷ = 13855703 is a prime.

It is a super-2 number, since 2×13855831² = 383968105401122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13855837) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36961 + ... + 37333.

Almost surely, 2^13855831 is an apocalyptic number.

13855831 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13855831 is a deficient number, since it is larger than the sum of its proper divisors (1464705).

13855831 is a wasteful number, since it uses less digits than its factorization.

13855831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702 (or 691 counting only the distinct ones).

The product of its digits is 14400, while the sum is 34.

The square root of 13855831 is about 3722.3421390302. The cubic root of 13855831 is about 240.1840659720.

The spelling of 13855831 in words is "thirteen million, eight hundred fifty-five thousand, eight hundred thirty-one".