18980390 has 48 divisors (see below), whose sum is σ = 40397616. Its totient is φ = 6364800.

The previous prime is 18980389. The next prime is 18980393. The reversal of 18980390 is 9308981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18980393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18080 + ... + 19100.

It is an arithmetic number, because the mean of its divisors is an integer number (841617).

Almost surely, 2^18980390 is an apocalyptic number.

18980390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18980390 is an abundant number, since it is smaller than the sum of its proper divisors (21417226).

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

18980390 is a wasteful number, since it uses less digits than its factorization.

18980390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1065 (or 1052 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 18980390 is about 4356.6489415605. The cubic root of 18980390 is about 266.7483308913.

The spelling of 18980390 in words is "eighteen million, nine hundred eighty thousand, three hundred ninety".