90436921 has 8 divisors (see below), whose sum is σ = 92591424. Its totient is φ = 88299120.

The previous prime is 90436901. The next prime is 90436933. The reversal of 90436921 is 12963409.

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

It is a cyclic number.

It is not a de Polignac number, because 90436921 - 2¹⁷ = 90305849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90436901) 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, 7140 + ... + 15226.

It is an arithmetic number, because the mean of its divisors is an integer number (11573928).

Almost surely, 2^90436921 is an apocalyptic number.

It is an amenable number.

90436921 is a deficient number, since it is larger than the sum of its proper divisors (2154503).

90436921 is a wasteful number, since it uses less digits than its factorization.

90436921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8351.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 90436921 is about 9509.8328586784. The cubic root of 90436921 is about 448.8644968197.

The spelling of 90436921 in words is "ninety million, four hundred thirty-six thousand, nine hundred twenty-one".