90979439 has 2 divisors, whose sum is σ = 90979440. Its totient is φ = 90979438.

The previous prime is 90979433. The next prime is 90979453. The reversal of 90979439 is 93497909.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90979439 - 2⁴ = 90979423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90979433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45489719 + 45489720.

It is an arithmetic number, because the mean of its divisors is an integer number (45489720).

Almost surely, 2^90979439 is an apocalyptic number.

90979439 is a deficient number, since it is larger than the sum of its proper divisors (1).

90979439 is an equidigital number, since it uses as much as digits as its factorization.

90979439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 551124, while the sum is 50.

The square root of 90979439 is about 9538.3142640615. The cubic root of 90979439 is about 449.7602657216.

The spelling of 90979439 in words is "ninety million, nine hundred seventy-nine thousand, four hundred thirty-nine".