90005239 has 2 divisors, whose sum is σ = 90005240. Its totient is φ = 90005238.

The previous prime is 90005231. The next prime is 90005243. The reversal of 90005239 is 93250009.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90005239 - 2³ = 90005231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90005231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45002619 + 45002620.

It is an arithmetic number, because the mean of its divisors is an integer number (45002620).

Almost surely, 2^90005239 is an apocalyptic number.

90005239 is a deficient number, since it is larger than the sum of its proper divisors (1).

90005239 is an equidigital number, since it uses as much as digits as its factorization.

90005239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2430, while the sum is 28.

The square root of 90005239 is about 9487.1090960313. The cubic root of 90005239 is about 448.1491700720.

The spelling of 90005239 in words is "ninety million, five thousand, two hundred thirty-nine".