90138434 has 8 divisors (see below), whose sum is σ = 135571260. Its totient is φ = 44948016.

The previous prime is 90138431. The next prime is 90138457. The reversal of 90138434 is 43483109.

It can be written as a sum of positive squares in 2 ways, for example, as 85285225 + 4853209 = 9235^2 + 2203^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 90138434.

It is not an unprimeable number, because it can be changed into a prime (90138431) 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, 59669 + ... + 61160.

Almost surely, 2^90138434 is an apocalyptic number.

90138434 is a deficient number, since it is larger than the sum of its proper divisors (45432826).

90138434 is a wasteful number, since it uses less digits than its factorization.

90138434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121204.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 90138434 is about 9494.1262894487. The cubic root of 90138434 is about 448.3701268692.

The spelling of 90138434 in words is "ninety million, one hundred thirty-eight thousand, four hundred thirty-four".