90129839 has 4 divisors (see below), whose sum is σ = 91830456. Its totient is φ = 88429224.

The previous prime is 90129799. The next prime is 90129859. The reversal of 90129839 is 93892109.

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

It is a cyclic number.

It is not a de Polignac number, because 90129839 - 2⁸ = 90129583 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90129796 and 90129805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90129859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 850229 + ... + 850334.

It is an arithmetic number, because the mean of its divisors is an integer number (22957614).

Almost surely, 2^90129839 is an apocalyptic number.

90129839 is a deficient number, since it is larger than the sum of its proper divisors (1700617).

90129839 is a wasteful number, since it uses less digits than its factorization.

90129839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1700616.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 90129839 is about 9493.6736303709. The cubic root of 90129839 is about 448.3558752211.

The spelling of 90129839 in words is "ninety million, one hundred twenty-nine thousand, eight hundred thirty-nine".