18918470 has 16 divisors (see below), whose sum is σ = 34974288. Its totient is φ = 7362720.

The previous prime is 18918457. The next prime is 18918499. The reversal of 18918470 is 7481981.

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, 25196 + ... + 25935.

It is an arithmetic number, because the mean of its divisors is an integer number (2185893).

Almost surely, 2^18918470 is an apocalyptic number.

18918470 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18918470 is a deficient number, since it is larger than the sum of its proper divisors (16055818).

18918470 is a wasteful number, since it uses less digits than its factorization.

18918470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51175.

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 18918470 is about 4349.5367569432. The cubic root of 18918470 is about 266.4579425739.

The spelling of 18918470 in words is "eighteen million, nine hundred eighteen thousand, four hundred seventy".