90599421 has 16 divisors (see below), whose sum is σ = 135344448. Its totient is φ = 53424000.

The previous prime is 90599413. The next prime is 90599437. The reversal of 90599421 is 12499509.

It is not a de Polignac number, because 90599421 - 2³ = 90599413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90599421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90599471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35880 + ... + 38321.

It is an arithmetic number, because the mean of its divisors is an integer number (8459028).

Almost surely, 2^90599421 is an apocalyptic number.

It is an amenable number.

90599421 is a deficient number, since it is larger than the sum of its proper divisors (44745027).

90599421 is a wasteful number, since it uses less digits than its factorization.

90599421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74252.

The product of its (nonzero) digits is 29160, while the sum is 39.

The square root of 90599421 is about 9518.3728126188. The cubic root of 90599421 is about 449.1331807312.

The spelling of 90599421 in words is "ninety million, five hundred ninety-nine thousand, four hundred twenty-one".