18621612 has 18 divisors (see below), whose sum is σ = 47071388. Its totient is φ = 6207192.

The previous prime is 18621599. The next prime is 18621637. The reversal of 18621612 is 21612681.

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 258598 + ... + 258669.

Almost surely, 2^18621612 is an apocalyptic number.

18621612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18621612 is an abundant number, since it is smaller than the sum of its proper divisors (28449776).

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

18621612 is a wasteful number, since it uses less digits than its factorization.

18621612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517277 (or 517272 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 18621612 is about 4315.2765844150. The cubic root of 18621612 is about 265.0568858535.

The spelling of 18621612 in words is "eighteen million, six hundred twenty-one thousand, six hundred twelve".