90123839 has 4 divisors (see below), whose sum is σ = 97056456. Its totient is φ = 83191224.

The previous prime is 90123833. The next prime is 90123893. The reversal of 90123839 is 93832109.

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 90123839 - 2¹⁶ = 90058303 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90123799 and 90123808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90123833) 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, 3466289 + ... + 3466314.

It is an arithmetic number, because the mean of its divisors is an integer number (24264114).

Almost surely, 2^90123839 is an apocalyptic number.

90123839 is a deficient number, since it is larger than the sum of its proper divisors (6932617).

90123839 is a wasteful number, since it uses less digits than its factorization.

90123839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6932616.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 90123839 is about 9493.3576252030. The cubic root of 90123839 is about 448.3459258896.

The spelling of 90123839 in words is "ninety million, one hundred twenty-three thousand, eight hundred thirty-nine".