18700900 has 18 divisors (see below), whose sum is σ = 40581170. Its totient is φ = 7480320.

The previous prime is 18700889. The next prime is 18700907. The reversal of 18700900 is 900781.

It can be written as a sum of positive squares in 3 ways, for example, as 2876416 + 15824484 = 1696^2 + 3978^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (18700907) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 93405 + ... + 93604.

Almost surely, 2^18700900 is an apocalyptic number.

18700900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18700900 is an abundant number, since it is smaller than the sum of its proper divisors (21880270).

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

18700900 is a wasteful number, since it uses less digits than its factorization.

18700900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187023 (or 187016 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 18700900 is about 4324.4537227261. The cubic root of 18700900 is about 265.4325438670.

It can be divided in two parts, 18700 and 900, that added together give a square (19600 = 140²).

The spelling of 18700900 in words is "eighteen million, seven hundred thousand, nine hundred".