90840923 has 4 divisors (see below), whose sum is σ = 91133328. Its totient is φ = 90548520.

The previous prime is 90840917. The next prime is 90840929. The reversal of 90840923 is 32904809.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (90840917) and next prime (90840929).

It is a cyclic number.

It is not a de Polignac number, because 90840923 - 2⁴ = 90840907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90840929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145736 + ... + 146357.

It is an arithmetic number, because the mean of its divisors is an integer number (22783332).

Almost surely, 2^90840923 is an apocalyptic number.

90840923 is a deficient number, since it is larger than the sum of its proper divisors (292405).

90840923 is a wasteful number, since it uses less digits than its factorization.

90840923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292404.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 90840923 is about 9531.0504667639. The cubic root of 90840923 is about 449.5318967732.

The spelling of 90840923 in words is "ninety million, eight hundred forty thousand, nine hundred twenty-three".