63972138 has 16 divisors (see below), whose sum is σ = 128201760. Its totient is φ = 21281136.

The previous prime is 63972133. The next prime is 63972157. The reversal of 63972138 is 83127936.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 63972096 and 63972105.

It is not an unprimeable number, because it can be changed into a prime (63972133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7420 + ... + 13527.

It is an arithmetic number, because the mean of its divisors is an integer number (8012610).

Almost surely, 2^63972138 is an apocalyptic number.

63972138 is an abundant number, since it is smaller than the sum of its proper divisors (64229622).

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

63972138 is a wasteful number, since it uses less digits than its factorization.

63972138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21461.

The product of its digits is 54432, while the sum is 39.

The square root of 63972138 is about 7998.2584354346. The cubic root of 63972138 is about 399.9419457413.

The spelling of 63972138 in words is "sixty-three million, nine hundred seventy-two thousand, one hundred thirty-eight".