90039409 has 4 divisors (see below), whose sum is σ = 90277360. Its totient is φ = 89801460.

The previous prime is 90039401. The next prime is 90039449. The reversal of 90039409 is 90493009.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90493009 = 37 ⋅2445757.

It is a cyclic number.

It is not a de Polignac number, because 90039409 - 2³ = 90039401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90039401) 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, 118407 + ... + 119164.

It is an arithmetic number, because the mean of its divisors is an integer number (22569340).

Almost surely, 2^90039409 is an apocalyptic number.

It is an amenable number.

90039409 is a deficient number, since it is larger than the sum of its proper divisors (237951).

90039409 is a wasteful number, since it uses less digits than its factorization.

90039409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237950.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 90039409 is about 9488.9097898547. The cubic root of 90039409 is about 448.2058753625.

The spelling of 90039409 in words is "ninety million, thirty-nine thousand, four hundred nine".