90202393 has 4 divisors (see below), whose sum is σ = 91095588. Its totient is φ = 89309200.

The previous prime is 90202381. The next prime is 90202397. The reversal of 90202393 is 39320209.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 87759424 + 2442969 = 9368^2 + 1563^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90202393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90202397) 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, 446446 + ... + 446647.

It is an arithmetic number, because the mean of its divisors is an integer number (22773897).

Almost surely, 2^90202393 is an apocalyptic number.

It is an amenable number.

90202393 is a deficient number, since it is larger than the sum of its proper divisors (893195).

90202393 is a wasteful number, since it uses less digits than its factorization.

90202393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 893194.

The product of its (nonzero) digits is 2916, while the sum is 28.

The square root of 90202393 is about 9497.4940379028. The cubic root of 90202393 is about 448.4761509167.

The spelling of 90202393 in words is "ninety million, two hundred two thousand, three hundred ninety-three".