83721972 has 24 divisors (see below), whose sum is σ = 200632096. Its totient is φ = 27152928.

The previous prime is 83721949. The next prime is 83721997. The reversal of 83721972 is 27912738.

It is a self number, because there is not a number n which added to its sum of digits gives 83721972.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93838 + ... + 94725.

Almost surely, 2^83721972 is an apocalyptic number.

It is an amenable number.

83721972 is an abundant number, since it is smaller than the sum of its proper divisors (116910124).

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

83721972 is a wasteful number, since it uses less digits than its factorization.

83721972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188607 (or 188605 counting only the distinct ones).

The product of its digits is 42336, while the sum is 39.

The square root of 83721972 is about 9149.9711474955. The cubic root of 83721972 is about 437.4681938238.

The spelling of 83721972 in words is "eighty-three million, seven hundred twenty-one thousand, nine hundred seventy-two".