90439 has 2 divisors, whose sum is σ = 90440. Its totient is φ = 90438.

The previous prime is 90437. The next prime is 90469. The reversal of 90439 is 93409.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90439 - 2¹ = 90437 is a prime.

Together with 90437, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45219 + 45220.

It is an arithmetic number, because the mean of its divisors is an integer number (45220).

2⁹⁰⁴³⁹ is an apocalyptic number.

90439 is a deficient number, since it is larger than the sum of its proper divisors (1).

90439 is an equidigital number, since it uses as much as digits as its factorization.

90439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 90439 is about 300.7307766092. The cubic root of 90439 is about 44.8867936352.

It can be divided in two parts, 90 and 439, that added together give a square (529 = 23²).

The spelling of 90439 in words is "ninety thousand, four hundred thirty-nine".