7638979 has 2 divisors, whose sum is σ = 7638980. Its totient is φ = 7638978.

The previous prime is 7638973. The next prime is 7638991. The reversal of 7638979 is 9798367.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7638979 - 2³ = 7638971 is a prime.

It is not a weakly prime, because it can be changed into another prime (7638971) 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 as a sum of consecutive naturals, namely, 3819489 + 3819490.

It is an arithmetic number, because the mean of its divisors is an integer number (3819490).

Almost surely, 2^7638979 is an apocalyptic number.

7638979 is a deficient number, since it is larger than the sum of its proper divisors (1).

7638979 is an equidigital number, since it uses as much as digits as its factorization.

7638979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 571536, while the sum is 49.

The square root of 7638979 is about 2763.8702936281. The cubic root of 7638979 is about 196.9450661504.

The spelling of 7638979 in words is "seven million, six hundred thirty-eight thousand, nine hundred seventy-nine".