7972391 has 8 divisors (see below), whose sum is σ = 9129120. Its totient is φ = 6820128.

The previous prime is 7972387. The next prime is 7972411. The reversal of 7972391 is 1932797.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7972391 - 2² = 7972387 is a prime.

7972391 is a modest number, since divided by 2391 gives 797 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7972351) 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 7 ways as a sum of consecutive naturals, for example, 4865 + ... + 6293.

It is an arithmetic number, because the mean of its divisors is an integer number (1141140).

Almost surely, 2^7972391 is an apocalyptic number.

7972391 is a deficient number, since it is larger than the sum of its proper divisors (1156729).

7972391 is a wasteful number, since it uses less digits than its factorization.

7972391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2233.

The product of its digits is 23814, while the sum is 38.

The square root of 7972391 is about 2823.5422787697. The cubic root of 7972391 is about 199.7696598188.

The spelling of 7972391 in words is "seven million, nine hundred seventy-two thousand, three hundred ninety-one".