13781957 has 8 divisors (see below), whose sum is σ = 15790656. Its totient is φ = 11783232.

The previous prime is 13781953. The next prime is 13781959. The reversal of 13781957 is 75918731.

13781957 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13781957 - 2² = 13781953 is a prime.

It is a super-3 number, since 3×13781957³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13781953) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 758 + ... + 5304.

It is an arithmetic number, because the mean of its divisors is an integer number (1973832).

Almost surely, 2^13781957 is an apocalyptic number.

It is an amenable number.

13781957 is a deficient number, since it is larger than the sum of its proper divisors (2008699).

13781957 is an equidigital number, since it uses as much as digits as its factorization.

13781957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4987.

The product of its digits is 52920, while the sum is 41.

The square root of 13781957 is about 3712.4058237213. The cubic root of 13781957 is about 239.7564485300.

The spelling of 13781957 in words is "thirteen million, seven hundred eighty-one thousand, nine hundred fifty-seven".