18700890 has 32 divisors (see below), whose sum is σ = 48335616. Its totient is φ = 4603200.

The previous prime is 18700889. The next prime is 18700907. The reversal of 18700890 is 9800781.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23586 + ... + 24365.

It is an arithmetic number, because the mean of its divisors is an integer number (1510488).

Almost surely, 2^18700890 is an apocalyptic number.

18700890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18700890 is an abundant number, since it is smaller than the sum of its proper divisors (29634726).

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

18700890 is a wasteful number, since it uses less digits than its factorization.

18700890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47974.

The product of its (nonzero) digits is 4032, while the sum is 33.

The square root of 18700890 is about 4324.4525665106. The cubic root of 18700890 is about 265.4324965551.

The spelling of 18700890 in words is "eighteen million, seven hundred thousand, eight hundred ninety".