90393997 has 8 divisors (see below), whose sum is σ = 93330432. Its totient is φ = 87483600.

The previous prime is 90393983. The next prime is 90394013. The reversal of 90393997 is 79939309.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90393997 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90393997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90393907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 672 + ... + 13462.

It is an arithmetic number, because the mean of its divisors is an integer number (11666304).

Almost surely, 2^90393997 is an apocalyptic number.

It is an amenable number.

90393997 is a deficient number, since it is larger than the sum of its proper divisors (2936435).

90393997 is a wasteful number, since it uses less digits than its factorization.

90393997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13019.

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

The square root of 90393997 is about 9507.5757688277. The cubic root of 90393997 is about 448.7934708549.

The spelling of 90393997 in words is "ninety million, three hundred ninety-three thousand, nine hundred ninety-seven".