18915464 has 8 divisors (see below), whose sum is σ = 35466510. Its totient is φ = 9457728.

The previous prime is 18915461. The next prime is 18915497. The reversal of 18915464 is 46451981.

It can be written as a sum of positive squares in only one way, i.e., 18852964 + 62500 = 4342^2 + 250^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (18915461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1182209 + ... + 1182224.

Almost surely, 2^18915464 is an apocalyptic number.

It is an amenable number.

18915464 is a deficient number, since it is larger than the sum of its proper divisors (16551046).

18915464 is a wasteful number, since it uses less digits than its factorization.

18915464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2364439 (or 2364435 counting only the distinct ones).

The product of its digits is 34560, while the sum is 38.

The square root of 18915464 is about 4349.1911891753. The cubic root of 18915464 is about 266.4438291175.

The spelling of 18915464 in words is "eighteen million, nine hundred fifteen thousand, four hundred sixty-four".