18990270 has 48 divisors (see below), whose sum is σ = 53176032. Its totient is φ = 4674240.

The previous prime is 18990247. The next prime is 18990277. The reversal of 18990270 is 7209981.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18990277) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6946 + ... + 9285.

It is an arithmetic number, because the mean of its divisors is an integer number (1107834).

Almost surely, 2^18990270 is an apocalyptic number.

18990270 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18990270 is an abundant number, since it is smaller than the sum of its proper divisors (34185762).

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

18990270 is a wasteful number, since it uses less digits than its factorization.

18990270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16257 (or 16254 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 18990270 is about 4357.7826930677. The cubic root of 18990270 is about 266.7946070102.

The spelling of 18990270 in words is "eighteen million, nine hundred ninety thousand, two hundred seventy".