90400422 has 32 divisors (see below), whose sum is σ = 208645632. Its totient is φ = 25576704.

The previous prime is 90400421. The next prime is 90400439. The reversal of 90400422 is 22400409.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90400421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6123 + ... + 14774.

It is an arithmetic number, because the mean of its divisors is an integer number (6520176).

Almost surely, 2^90400422 is an apocalyptic number.

90400422 is an abundant number, since it is smaller than the sum of its proper divisors (118245210).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90400422 is a wasteful number, since it uses less digits than its factorization.

90400422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21012.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 90400422 is about 9507.9136512697. The cubic root of 90400422 is about 448.8041036766.

The spelling of 90400422 in words is "ninety million, four hundred thousand, four hundred twenty-two".