122398391 has 16 divisors (see below), whose sum is σ = 128563200. Its totient is φ = 116440800.

The previous prime is 122398363. The next prime is 122398411. The reversal of 122398391 is 193893221.

It is a cyclic number.

It is not a de Polignac number, because 122398391 - 2⁶ = 122398327 is a prime.

It is a super-2 number, since 2×122398391² = 29962732238777762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122398301) 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 15 ways as a sum of consecutive naturals, for example, 255290 + ... + 255768.

It is an arithmetic number, because the mean of its divisors is an integer number (8035200).

Almost surely, 2^122398391 is an apocalyptic number.

122398391 is a deficient number, since it is larger than the sum of its proper divisors (6164809).

122398391 is an equidigital number, since it uses as much as digits as its factorization.

122398391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670.

The product of its digits is 23328, while the sum is 38.

The square root of 122398391 is about 11063.3806316153. The cubic root of 122398391 is about 496.5068405056.

The spelling of 122398391 in words is "one hundred twenty-two million, three hundred ninety-eight thousand, three hundred ninety-one".