18923690 has 16 divisors (see below), whose sum is σ = 34128000. Its totient is φ = 7554960.

The previous prime is 18923651. The next prime is 18923743. The reversal of 18923690 is 9632981.

It is a super-2 number, since 2×18923690² = 716212086432200, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

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, 4811 + ... + 7809.

It is an arithmetic number, because the mean of its divisors is an integer number (2133000).

Almost surely, 2^18923690 is an apocalyptic number.

18923690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18923690 is a deficient number, since it is larger than the sum of its proper divisors (15204310).

18923690 is a wasteful number, since it uses less digits than its factorization.

18923690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3637.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 18923690 is about 4350.1367794588. The cubic root of 18923690 is about 266.4824474193.

The spelling of 18923690 in words is "eighteen million, nine hundred twenty-three thousand, six hundred ninety".