18621964 has 12 divisors (see below), whose sum is σ = 33282144. Its totient is φ = 9112784.

The previous prime is 18621961. The next prime is 18621971. The reversal of 18621964 is 46912681.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18621961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49339 + ... + 49714.

It is an arithmetic number, because the mean of its divisors is an integer number (2773512).

Almost surely, 2^18621964 is an apocalyptic number.

It is an amenable number.

18621964 is a deficient number, since it is larger than the sum of its proper divisors (14660180).

18621964 is a wasteful number, since it uses less digits than its factorization.

18621964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99104 (or 99102 counting only the distinct ones).

The product of its digits is 20736, while the sum is 37.

The square root of 18621964 is about 4315.3173695570. The cubic root of 18621964 is about 265.0585559459.

The spelling of 18621964 in words is "eighteen million, six hundred twenty-one thousand, nine hundred sixty-four".