18870957 has 12 divisors (see below), whose sum is σ = 31152160. Its totient is φ = 10783368.

The previous prime is 18870949. The next prime is 18870959. The reversal of 18870957 is 75907881.

It is not a de Polignac number, because 18870957 - 2³ = 18870949 is a prime.

It is a super-2 number, since 2×18870957² = 712226036191698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18870959) 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, 149707 + ... + 149832.

Almost surely, 2^18870957 is an apocalyptic number.

It is an amenable number.

18870957 is a deficient number, since it is larger than the sum of its proper divisors (12281203).

18870957 is a wasteful number, since it uses less digits than its factorization.

18870957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299552 (or 299549 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 45.

The square root of 18870957 is about 4344.0714773125. The cubic root of 18870957 is about 266.2346893265.

The spelling of 18870957 in words is "eighteen million, eight hundred seventy thousand, nine hundred fifty-seven".