90123438 has 16 divisors (see below), whose sum is σ = 180475776. Its totient is φ = 30003000.

The previous prime is 90123427. The next prime is 90123461. The reversal of 90123438 is 83432109.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4188 + ... + 14063.

It is an arithmetic number, because the mean of its divisors is an integer number (11279736).

Almost surely, 2^90123438 is an apocalyptic number.

90123438 is an abundant number, since it is smaller than the sum of its proper divisors (90352338).

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

90123438 is a wasteful number, since it uses less digits than its factorization.

90123438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19079.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 90123438 is about 9493.3365051493. The cubic root of 90123438 is about 448.3452609268.

The spelling of 90123438 in words is "ninety million, one hundred twenty-three thousand, four hundred thirty-eight".