123998091 has 16 divisors (see below), whose sum is σ = 189122304. Its totient is φ = 70791264.

The previous prime is 123998089. The next prime is 123998141. The reversal of 123998091 is 190899321.

It is not a de Polignac number, because 123998091 - 2¹ = 123998089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123998011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30045 + ... + 33921.

It is an arithmetic number, because the mean of its divisors is an integer number (11820144).

Almost surely, 2^123998091 is an apocalyptic number.

123998091 is a deficient number, since it is larger than the sum of its proper divisors (65124213).

123998091 is a wasteful number, since it uses less digits than its factorization.

123998091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5410.

The product of its (nonzero) digits is 34992, while the sum is 42.

The square root of 123998091 is about 11135.4430086997. The cubic root of 123998091 is about 498.6605362111.

The spelling of 123998091 in words is "one hundred twenty-three million, nine hundred ninety-eight thousand, ninety-one".