90836421 has 16 divisors (see below), whose sum is σ = 131703936. Its totient is φ = 55354176.

The previous prime is 90836413. The next prime is 90836441. The reversal of 90836421 is 12463809.

It is not a de Polignac number, because 90836421 - 2³ = 90836413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90836401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7290 + ... + 15323.

It is an arithmetic number, because the mean of its divisors is an integer number (8231496).

Almost surely, 2^90836421 is an apocalyptic number.

It is an amenable number.

90836421 is a deficient number, since it is larger than the sum of its proper divisors (40867515).

90836421 is a wasteful number, since it uses less digits than its factorization.

90836421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22732.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 90836421 is about 9530.8142884016. The cubic root of 90836421 is about 449.5244705092.

The spelling of 90836421 in words is "ninety million, eight hundred thirty-six thousand, four hundred twenty-one".