90000438 has 32 divisors (see below), whose sum is σ = 196756992. Its totient is φ = 27218400.

The previous prime is 90000433. The next prime is 90000439. The reversal of 90000438 is 83400009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90000433) 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, 42595 + ... + 44657.

It is an arithmetic number, because the mean of its divisors is an integer number (6148656).

Almost surely, 2^90000438 is an apocalyptic number.

90000438 is an abundant number, since it is smaller than the sum of its proper divisors (106756554).

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

90000438 is a wasteful number, since it uses less digits than its factorization.

90000438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2740.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 90000438 is about 9486.8560651040. The cubic root of 90000438 is about 448.1412016380.

The spelling of 90000438 in words is "ninety million, four hundred thirty-eight", and thus it is an aban number.