90421873 has 4 divisors (see below), whose sum is σ = 90444400. Its totient is φ = 90399348.

The previous prime is 90421867. The next prime is 90421889. The reversal of 90421873 is 37812409.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 90421873 - 2²¹ = 88324721 is a prime.

It is a super-2 number, since 2×90421873² = 16352230233656258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90421853) 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, 3423 + ... + 13876.

It is an arithmetic number, because the mean of its divisors is an integer number (22611100).

Almost surely, 2^90421873 is an apocalyptic number.

It is an amenable number.

90421873 is a deficient number, since it is larger than the sum of its proper divisors (22527).

90421873 is a wasteful number, since it uses less digits than its factorization.

90421873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22526.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 90421873 is about 9509.0416446664. The cubic root of 90421873 is about 448.8395995855.

The spelling of 90421873 in words is "ninety million, four hundred twenty-one thousand, eight hundred seventy-three".