90940321 has 4 divisors (see below), whose sum is σ = 94894272. Its totient is φ = 86986372.

The previous prime is 90940307. The next prime is 90940357. The reversal of 90940321 is 12304909.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12304909 = 113 ⋅108893.

It is a cyclic number.

It is not a de Polignac number, because 90940321 - 2⁷ = 90940193 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90940321.

It is not an unprimeable number, because it can be changed into a prime (90940301) 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, 1976941 + ... + 1976986.

It is an arithmetic number, because the mean of its divisors is an integer number (23723568).

Almost surely, 2^90940321 is an apocalyptic number.

It is an amenable number.

90940321 is a deficient number, since it is larger than the sum of its proper divisors (3953951).

90940321 is a wasteful number, since it uses less digits than its factorization.

90940321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3953950.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 90940321 is about 9536.2634716119. The cubic root of 90940321 is about 449.6957960479.

The spelling of 90940321 in words is "ninety million, nine hundred forty thousand, three hundred twenty-one".