18940390 has 16 divisors (see below), whose sum is σ = 38963232. Its totient is φ = 6493824.

The previous prime is 18940379. The next prime is 18940409. The reversal of 18940390 is 9304981.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135219 + ... + 135358.

It is an arithmetic number, because the mean of its divisors is an integer number (2435202).

Almost surely, 2^18940390 is an apocalyptic number.

18940390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18940390 is an abundant number, since it is smaller than the sum of its proper divisors (20022842).

18940390 is a wasteful number, since it uses less digits than its factorization.

18940390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270591.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 18940390 is about 4352.0558360389. The cubic root of 18940390 is about 266.5608138903.

The spelling of 18940390 in words is "eighteen million, nine hundred forty thousand, three hundred ninety".