90000123 has 4 divisors (see below), whose sum is σ = 120000168. Its totient is φ = 60000080.

The previous prime is 90000121. The next prime is 90000133. The reversal of 90000123 is 32100009.

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 90000123 - 2¹ = 90000121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90000121) 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, 15000018 + ... + 15000023.

It is an arithmetic number, because the mean of its divisors is an integer number (30000042).

Almost surely, 2^90000123 is an apocalyptic number.

90000123 is a deficient number, since it is larger than the sum of its proper divisors (30000045).

90000123 is a wasteful number, since it uses less digits than its factorization.

90000123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30000044.

The product of its (nonzero) digits is 54, while the sum is 15.

The square root of 90000123 is about 9486.8394631721. The cubic root of 90000123 is about 448.1406788085.

The spelling of 90000123 in words is "ninety million, one hundred twenty-three", and thus it is an aban number.