90385979 has 4 divisors (see below), whose sum is σ = 90425880. Its totient is φ = 90346080.

The previous prime is 90385943. The next prime is 90385993. The reversal of 90385979 is 97958309.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97958309 = 173 ⋅566233.

It is a cyclic number.

It is not a de Polignac number, because 90385979 - 2¹² = 90381883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90385879) 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, 16334 + ... + 21155.

It is an arithmetic number, because the mean of its divisors is an integer number (22606470).

Almost surely, 2^90385979 is an apocalyptic number.

90385979 is a deficient number, since it is larger than the sum of its proper divisors (39901).

90385979 is a wasteful number, since it uses less digits than its factorization.

90385979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39900.

The product of its (nonzero) digits is 612360, while the sum is 50.

The square root of 90385979 is about 9507.1540957323. The cubic root of 90385979 is about 448.7802010488.

The spelling of 90385979 in words is "ninety million, three hundred eighty-five thousand, nine hundred seventy-nine".