18813870 has 40 divisors (see below), whose sum is σ = 50590584. Its totient is φ = 5016816.

The previous prime is 18813863. The next prime is 18813913. The reversal of 18813870 is 7831881.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 10804 + ... + 12423.

Almost surely, 2^18813870 is an apocalyptic number.

18813870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18813870 is an abundant number, since it is smaller than the sum of its proper divisors (31776714).

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

18813870 is a wasteful number, since it uses less digits than its factorization.

18813870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23246 (or 23237 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

The square root of 18813870 is about 4337.4958213236. The cubic root of 18813870 is about 265.9659537709.

It can be divided in two parts, 18813 and 870, that added together give a 9-th power (19683 = 3⁹).

The spelling of 18813870 in words is "eighteen million, eight hundred thirteen thousand, eight hundred seventy".