90400189 has 16 divisors (see below), whose sum is σ = 103791744. Its totient is φ = 78582240.

The previous prime is 90400187. The next prime is 90400199. The reversal of 90400189 is 98100409.

It is not a de Polignac number, because 90400189 - 2¹ = 90400187 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 90400189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90400181) 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, 29137 + ... + 32089.

It is an arithmetic number, because the mean of its divisors is an integer number (6486984).

Almost surely, 2^90400189 is an apocalyptic number.

It is an amenable number.

90400189 is a deficient number, since it is larger than the sum of its proper divisors (13391555).

90400189 is a wasteful number, since it uses less digits than its factorization.

90400189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3009 (or 2987 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 90400189 is about 9507.9013983108. The cubic root of 90400189 is about 448.8037180904.

The spelling of 90400189 in words is "ninety million, four hundred thousand, one hundred eighty-nine".