90400231 has 4 divisors (see below), whose sum is σ = 91882264. Its totient is φ = 88918200.

The previous prime is 90400199. The next prime is 90400243. The reversal of 90400231 is 13200409.

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

It is a cyclic number.

It is not a de Polignac number, because 90400231 - 2⁵ = 90400199 is a prime.

It is a super-2 number, since 2×90400231² = 16344403529706722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90400199 and 90400208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90400931) 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, 740925 + ... + 741046.

It is an arithmetic number, because the mean of its divisors is an integer number (22970566).

Almost surely, 2^90400231 is an apocalyptic number.

90400231 is a deficient number, since it is larger than the sum of its proper divisors (1482033).

90400231 is a wasteful number, since it uses less digits than its factorization.

90400231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1482032.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 90400231 is about 9507.9036069998. The cubic root of 90400231 is about 448.8037875953.

The spelling of 90400231 in words is "ninety million, four hundred thousand, two hundred thirty-one".