1638172912 has 20 divisors (see below), whose sum is σ = 3175511536. Its totient is φ = 818686080.

The previous prime is 1638172903. The next prime is 1638172931. The reversal of 1638172912 is 2192718361.

It is a super-2 number, since 2×1638172912² = 5367220979221119488, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10237 + ... + 58147.

Almost surely, 2^1638172912 is an apocalyptic number.

It is an amenable number.

1638172912 is a deficient number, since it is larger than the sum of its proper divisors (1537338624).

1638172912 is a wasteful number, since it uses less digits than its factorization.

1638172912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50056 (or 50050 counting only the distinct ones).

The product of its digits is 36288, while the sum is 40.

The square root of 1638172912 is about 40474.3488150211. The cubic root of 1638172912 is about 1178.8356109451.

The spelling of 1638172912 in words is "one billion, six hundred thirty-eight million, one hundred seventy-two thousand, nine hundred twelve".