13981857 has 8 divisors (see below), whose sum is σ = 19285440. Its totient is φ = 8999760.

The previous prime is 13981843. The next prime is 13981883. The reversal of 13981857 is 75818931.

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

It is not a de Polignac number, because 13981857 - 2⁷ = 13981729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13981897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80269 + ... + 80442.

It is an arithmetic number, because the mean of its divisors is an integer number (2410680).

Almost surely, 2^13981857 is an apocalyptic number.

It is an amenable number.

13981857 is a deficient number, since it is larger than the sum of its proper divisors (5303583).

13981857 is a wasteful number, since it uses less digits than its factorization.

13981857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160743.

The product of its digits is 60480, while the sum is 42.

The square root of 13981857 is about 3739.2321404267. The cubic root of 13981857 is about 240.9100690037.

The spelling of 13981857 in words is "thirteen million, nine hundred eighty-one thousand, eight hundred fifty-seven".