122398657 has 4 divisors (see below), whose sum is σ = 129598596. Its totient is φ = 115198720.

The previous prime is 122398651. The next prime is 122398667. The reversal of 122398657 is 756893221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 45643536 + 76755121 = 6756^2 + 8761^2 .

It is a cyclic number.

It is not a de Polignac number, because 122398657 - 2¹⁵ = 122365889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (122398651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3599944 + ... + 3599977.

It is an arithmetic number, because the mean of its divisors is an integer number (32399649).

Almost surely, 2^122398657 is an apocalyptic number.

122398657 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

122398657 is a deficient number, since it is larger than the sum of its proper divisors (7199939).

122398657 is an equidigital number, since it uses as much as digits as its factorization.

122398657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7199938.

The product of its digits is 181440, while the sum is 43.

The square root of 122398657 is about 11063.3926532506. The cubic root of 122398657 is about 496.5072001801.

The spelling of 122398657 in words is "one hundred twenty-two million, three hundred ninety-eight thousand, six hundred fifty-seven".