90979393 has 4 divisors (see below), whose sum is σ = 96331140. Its totient is φ = 85627648.

The previous prime is 90979387. The next prime is 90979403. The reversal of 90979393 is 39397909.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39397909 = 2273 ⋅17333.

It can be written as a sum of positive squares in 2 ways, for example, as 41319184 + 49660209 = 6428^2 + 7047^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90979393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90979303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2675848 + ... + 2675881.

It is an arithmetic number, because the mean of its divisors is an integer number (24082785).

Almost surely, 2^90979393 is an apocalyptic number.

It is an amenable number.

90979393 is a deficient number, since it is larger than the sum of its proper divisors (5351747).

90979393 is a wasteful number, since it uses less digits than its factorization.

90979393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5351746.

The product of its (nonzero) digits is 413343, while the sum is 49.

The square root of 90979393 is about 9538.3118527337. The cubic root of 90979393 is about 449.7601899207.

The spelling of 90979393 in words is "ninety million, nine hundred seventy-nine thousand, three hundred ninety-three".