90291399 has 32 divisors (see below), whose sum is σ = 137839104. Its totient is φ = 52039680.

The previous prime is 90291379. The next prime is 90291419. The reversal of 90291399 is 99319209.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (90291379) and next prime (90291419).

It is not a de Polignac number, because 90291399 - 2⁹ = 90290887 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90291399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90291329) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 255607 + ... + 255959.

It is an arithmetic number, because the mean of its divisors is an integer number (4307472).

Almost surely, 2^90291399 is an apocalyptic number.

90291399 is a deficient number, since it is larger than the sum of its proper divisors (47547705).

90291399 is a wasteful number, since it uses less digits than its factorization.

90291399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 727.

The product of its (nonzero) digits is 39366, while the sum is 42.

The square root of 90291399 is about 9502.1786449214. The cubic root of 90291399 is about 448.6236116989.

The spelling of 90291399 in words is "ninety million, two hundred ninety-one thousand, three hundred ninety-nine".