6138991972 has 12 divisors (see below), whose sum is σ = 10771584880. Its totient is φ = 3061396296.

The previous prime is 6138991927. The next prime is 6138991981. The reversal of 6138991972 is 2791998316.

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

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, 2023218 + ... + 2026249.

Almost surely, 2^6138991972 is an apocalyptic number.

It is an amenable number.

6138991972 is a deficient number, since it is larger than the sum of its proper divisors (4632592908).

6138991972 is a wasteful number, since it uses less digits than its factorization.

6138991972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4049850 (or 4049848 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 55.

The square root of 6138991972 is about 78351.7196492840. The cubic root of 6138991972 is about 1831.0450173134.

The spelling of 6138991972 in words is "six billion, one hundred thirty-eight million, nine hundred ninety-one thousand, nine hundred seventy-two".