122391999 has 48 divisors (see below), whose sum is σ = 193039200. Its totient is φ = 76602240.

The previous prime is 122391991. The next prime is 122392007. The reversal of 122391999 is 999193221.

It is an interprime number because it is at equal distance from previous prime (122391991) and next prime (122392007).

It is not a de Polignac number, because 122391999 - 2³ = 122391991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122391991) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1375147 + ... + 1375235.

It is an arithmetic number, because the mean of its divisors is an integer number (4021650).

Almost surely, 2^122391999 is an apocalyptic number.

122391999 is a deficient number, since it is larger than the sum of its proper divisors (70647201).

122391999 is an equidigital number, since it uses as much as digits as its factorization.

122391999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213 (or 176 counting only the distinct ones).

The product of its digits is 78732, while the sum is 45.

The square root of 122391999 is about 11063.0917468852. The cubic root of 122391999 is about 496.4981973447.

The spelling of 122391999 in words is "one hundred twenty-two million, three hundred ninety-one thousand, nine hundred ninety-nine".