18121470 has 32 divisors (see below), whose sum is σ = 45384192. Its totient is φ = 4622112.

The previous prime is 18121469. The next prime is 18121517. The reversal of 18121470 is 7412181.

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

It is a self number, because there is not a number n which added to its sum of digits gives 18121470.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12442 + ... + 13821.

It is an arithmetic number, because the mean of its divisors is an integer number (1418256).

Almost surely, 2^18121470 is an apocalyptic number.

18121470 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18121470 is an abundant number, since it is smaller than the sum of its proper divisors (27262722).

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

18121470 is a wasteful number, since it uses less digits than its factorization.

18121470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26296.

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 18121470 is about 4256.9319938190. The cubic root of 18121470 is about 262.6623394920.

The spelling of 18121470 in words is "eighteen million, one hundred twenty-one thousand, four hundred seventy".