18990370 has 32 divisors (see below), whose sum is σ = 39626496. Its totient is φ = 6417600.

The previous prime is 18990359. The next prime is 18990373. The reversal of 18990370 is 7309981.

It is not an unprimeable number, because it can be changed into a prime (18990373) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3060 + ... + 6880.

It is an arithmetic number, because the mean of its divisors is an integer number (1238328).

Almost surely, 2^18990370 is an apocalyptic number.

18990370 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18990370 is an abundant number, since it is smaller than the sum of its proper divisors (20636126).

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

18990370 is a wasteful number, since it uses less digits than its factorization.

18990370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3906.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 18990370 is about 4357.7941667775. The cubic root of 18990370 is about 266.7950753099.

The spelling of 18990370 in words is "eighteen million, nine hundred ninety thousand, three hundred seventy".