90423079 has 4 divisors (see below), whose sum is σ = 92866984. Its totient is φ = 87979176.

The previous prime is 90423077. The next prime is 90423083. The reversal of 90423079 is 97032409.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97032409 = 8263 ⋅11743.

It is a cyclic number.

It is not a de Polignac number, because 90423079 - 2¹ = 90423077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90423077) 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, 1221897 + ... + 1221970.

It is an arithmetic number, because the mean of its divisors is an integer number (23216746).

Almost surely, 2^90423079 is an apocalyptic number.

90423079 is a deficient number, since it is larger than the sum of its proper divisors (2443905).

90423079 is a wasteful number, since it uses less digits than its factorization.

90423079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2443904.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 90423079 is about 9509.1050577854. The cubic root of 90423079 is about 448.8415950398.

It can be divided in two parts, 9042 and 3079, that added together give a palindrome (12121).

The spelling of 90423079 in words is "ninety million, four hundred twenty-three thousand, seventy-nine".