90142239 has 32 divisors (see below), whose sum is σ = 134922240. Its totient is φ = 53071200.

The previous prime is 90142229. The next prime is 90142243. The reversal of 90142239 is 93224109.

It is not a de Polignac number, because 90142239 - 2⁵ = 90142207 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90142229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 184854 + ... + 185340.

It is an arithmetic number, because the mean of its divisors is an integer number (4216320).

Almost surely, 2^90142239 is an apocalyptic number.

90142239 is a deficient number, since it is larger than the sum of its proper divisors (44780001).

90142239 is a wasteful number, since it uses less digits than its factorization.

90142239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 90142239 is about 9494.3266743882. The cubic root of 90142239 is about 448.3764357738.

The spelling of 90142239 in words is "ninety million, one hundred forty-two thousand, two hundred thirty-nine".