90409139 has 4 divisors (see below), whose sum is σ = 90445200. Its totient is φ = 90373080.

The previous prime is 90409133. The next prime is 90409157. The reversal of 90409139 is 93190409.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93190409 = 13 ⋅7168493.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90409139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90409099 and 90409108.

It is not an unprimeable number, because it can be changed into a prime (90409133) 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, 13964 + ... + 19385.

It is an arithmetic number, because the mean of its divisors is an integer number (22611300).

Almost surely, 2^90409139 is an apocalyptic number.

90409139 is a deficient number, since it is larger than the sum of its proper divisors (36061).

90409139 is a wasteful number, since it uses less digits than its factorization.

90409139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36060.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 90409139 is about 9508.3720478324. The cubic root of 90409139 is about 448.8185287554.

The spelling of 90409139 in words is "ninety million, four hundred nine thousand, one hundred thirty-nine".