123988999 has 8 divisors (see below), whose sum is σ = 125948160. Its totient is φ = 122039736.

The previous prime is 123988951. The next prime is 123989017. The reversal of 123988999 is 999889321.

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

It is a cyclic number.

It is not a de Polignac number, because 123988999 - 2²⁵ = 90434567 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 (123988099) 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, 25152 + ... + 29674.

It is an arithmetic number, because the mean of its divisors is an integer number (15743520).

Almost surely, 2^123988999 is an apocalyptic number.

123988999 is a deficient number, since it is larger than the sum of its proper divisors (1959161).

123988999 is an equidigital number, since it uses as much as digits as its factorization.

123988999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4949.

The product of its digits is 2519424, while the sum is 58.

The square root of 123988999 is about 11135.0347552219. The cubic root of 123988999 is about 498.6483480331.

The spelling of 123988999 in words is "one hundred twenty-three million, nine hundred eighty-eight thousand, nine hundred ninety-nine".