83972989 has 16 divisors (see below), whose sum is σ = 90619200. Its totient is φ = 77573376.

The previous prime is 83972981. The next prime is 83973059. The reversal of 83972989 is 98927938.

It is a cyclic number.

It is not a de Polignac number, because 83972989 - 2³ = 83972981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83972981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 193717 + ... + 194149.

It is an arithmetic number, because the mean of its divisors is an integer number (5663700).

Almost surely, 2^83972989 is an apocalyptic number.

It is an amenable number.

83972989 is a deficient number, since it is larger than the sum of its proper divisors (6646211).

83972989 is a wasteful number, since it uses less digits than its factorization.

83972989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684.

The product of its digits is 1959552, while the sum is 55.

The square root of 83972989 is about 9163.6777005742. The cubic root of 83972989 is about 437.9049664200.

The spelling of 83972989 in words is "eighty-three million, nine hundred seventy-two thousand, nine hundred eighty-nine".