90408793 has 2 divisors, whose sum is σ = 90408794. Its totient is φ = 90408792.

The previous prime is 90408763. The next prime is 90408809. The reversal of 90408793 is 39780409.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67108864 + 23299929 = 8192^2 + 4827^2 .

It is a cyclic number.

It is not a de Polignac number, because 90408793 - 2⁵ = 90408761 is a prime.

It is not a weakly prime, because it can be changed into another prime (90408763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45204396 + 45204397.

It is an arithmetic number, because the mean of its divisors is an integer number (45204397).

Almost surely, 2^90408793 is an apocalyptic number.

It is an amenable number.

90408793 is a deficient number, since it is larger than the sum of its proper divisors (1).

90408793 is an equidigital number, since it uses as much as digits as its factorization.

90408793 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 90408793 is about 9508.3538533229. The cubic root of 90408793 is about 448.8179562048.

The spelling of 90408793 in words is "ninety million, four hundred eight thousand, seven hundred ninety-three".