90918405 has 12 divisors (see below), whose sum is σ = 157591980. Its totient is φ = 48489792.

The previous prime is 90918389. The next prime is 90918407. The reversal of 90918405 is 50481909.

It can be written as a sum of positive squares in 2 ways, for example, as 12383361 + 78535044 = 3519^2 + 8862^2 .

It is not a de Polignac number, because 90918405 - 2⁴ = 90918389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90918405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90918407) 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 11 ways as a sum of consecutive naturals, for example, 1010160 + ... + 1010249.

It is an arithmetic number, because the mean of its divisors is an integer number (13132665).

Almost surely, 2^90918405 is an apocalyptic number.

It is an amenable number.

90918405 is a deficient number, since it is larger than the sum of its proper divisors (66673575).

90918405 is a wasteful number, since it uses less digits than its factorization.

90918405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2020420 (or 2020417 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 90918405 is about 9535.1143149938. The cubic root of 90918405 is about 449.6596686009.

The spelling of 90918405 in words is "ninety million, nine hundred eighteen thousand, four hundred five".