7972945 has 16 divisors (see below), whose sum is σ = 9980928. Its totient is φ = 6108480.

The previous prime is 7972907. The next prime is 7972957. The reversal of 7972945 is 5492797.

It is not a de Polignac number, because 7972945 - 2⁷ = 7972817 is a prime.

It is a Duffinian number.

7972945 is a lucky number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 12832 + ... + 13438.

It is an arithmetic number, because the mean of its divisors is an integer number (623808).

Almost surely, 2^7972945 is an apocalyptic number.

It is an amenable number.

7972945 is a deficient number, since it is larger than the sum of its proper divisors (2007983).

7972945 is a wasteful number, since it uses less digits than its factorization.

7972945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720.

The product of its digits is 158760, while the sum is 43.

The square root of 7972945 is about 2823.6403807851. The cubic root of 7972945 is about 199.7742870308.

The spelling of 7972945 in words is "seven million, nine hundred seventy-two thousand, nine hundred forty-five".