18461564 has 24 divisors (see below), whose sum is σ = 35411376. Its totient is φ = 8352000.

The previous prime is 18461561. The next prime is 18461567. The reversal of 18461564 is 46516481.

It is an interprime number because it is at equal distance from previous prime (18461561) and next prime (18461567).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18461561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9734 + ... + 11474.

It is an arithmetic number, because the mean of its divisors is an integer number (1475474).

Almost surely, 2^18461564 is an apocalyptic number.

It is an amenable number.

18461564 is a deficient number, since it is larger than the sum of its proper divisors (16949812).

18461564 is a wasteful number, since it uses less digits than its factorization.

18461564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1997 (or 1995 counting only the distinct ones).

The product of its digits is 23040, while the sum is 35.

The square root of 18461564 is about 4296.6922161123. The cubic root of 18461564 is about 264.2953344719.

The spelling of 18461564 in words is "eighteen million, four hundred sixty-one thousand, five hundred sixty-four".