90939 has 4 divisors (see below), whose sum is σ = 121256. Its totient is φ = 60624.

The previous prime is 90931. The next prime is 90947. The reversal of 90939 is 93909.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (90931) and next prime (90947).

It is not a de Polignac number, because 90939 - 2³ = 90931 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

90939 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (90931) 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, 15154 + ... + 15159.

It is an arithmetic number, because the mean of its divisors is an integer number (30314).

2⁹⁰⁹³⁹ is an apocalyptic number.

90939 is a deficient number, since it is larger than the sum of its proper divisors (30317).

90939 is a wasteful number, since it uses less digits than its factorization.

90939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30316.

The product of its (nonzero) digits is 2187, while the sum is 30.

The square root of 90939 is about 301.5609391151. The cubic root of 90939 is about 44.9693618609.

Subtracting from 90939 its sum of digits (30), we obtain a palindrome (90909).

The spelling of 90939 in words is "ninety thousand, nine hundred thirty-nine".