18857550 has 24 divisors (see below), whose sum is σ = 46767096. Its totient is φ = 5028640.

The previous prime is 18857533. The next prime is 18857591. The reversal of 18857550 is 5575881.

It is a junction number, because it is equal to n+sod(n) for n = 18857499 and 18857508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62709 + ... + 63008.

It is an arithmetic number, because the mean of its divisors is an integer number (1948629).

Almost surely, 2^18857550 is an apocalyptic number.

18857550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18857550 is an abundant number, since it is smaller than the sum of its proper divisors (27909546).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18857550 is a wasteful number, since it uses less digits than its factorization.

18857550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125732 (or 125727 counting only the distinct ones).

The product of its (nonzero) digits is 56000, while the sum is 39.

The square root of 18857550 is about 4342.5280655397. The cubic root of 18857550 is about 266.1716249729.

The spelling of 18857550 in words is "eighteen million, eight hundred fifty-seven thousand, five hundred fifty".