90039 has 4 divisors (see below), whose sum is σ = 120056. Its totient is φ = 60024.

The previous prime is 90031. The next prime is 90053. The reversal of 90039 is 93009.

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

It is not a de Polignac number, because 90039 - 2³ = 90031 is a prime.

It is a D-number.

It is a Duffinian number.

90039 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 89997 and 90024.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15004 + ... + 15009.

It is an arithmetic number, because the mean of its divisors is an integer number (30014).

2⁹⁰⁰³⁹ is an apocalyptic number.

90039 is a deficient number, since it is larger than the sum of its proper divisors (30017).

90039 is a wasteful number, since it uses less digits than its factorization.

90039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30016.

The product of its (nonzero) digits is 243, while the sum is 21.

The square root of 90039 is about 300.0649929599. The cubic root of 90039 is about 44.8205196710.

It can be divided in two parts, 900 and 39, that added together give a palindrome (939).

The spelling of 90039 in words is "ninety thousand, thirty-nine".