90909123 has 8 divisors (see below), whose sum is σ = 121984848. Its totient is φ = 60219744.

The previous prime is 90909121. The next prime is 90909127. The reversal of 90909123 is 32190909.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 90909123 - 2¹ = 90909121 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (90909121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96036 + ... + 96977.

It is an arithmetic number, because the mean of its divisors is an integer number (15248106).

Almost surely, 2^90909123 is an apocalyptic number.

90909123 is a deficient number, since it is larger than the sum of its proper divisors (31075725).

90909123 is a wasteful number, since it uses less digits than its factorization.

90909123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193173.

The product of its (nonzero) digits is 4374, while the sum is 33.

The square root of 90909123 is about 9534.6275753172. The cubic root of 90909123 is about 449.6443659308.

The spelling of 90909123 in words is "ninety million, nine hundred nine thousand, one hundred twenty-three".