122721865 has 8 divisors (see below), whose sum is σ = 168304320. Its totient is φ = 84152112.

The previous prime is 122721857. The next prime is 122721877. The reversal of 122721865 is 568127221.

It is a happy number.

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 122721865 - 2³ = 122721857 is a prime.

It is a super-2 number, since 2×122721865² = 30121312298156450, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 122721865.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1753135 + ... + 1753204.

It is an arithmetic number, because the mean of its divisors is an integer number (21038040).

Almost surely, 2^122721865 is an apocalyptic number.

It is an amenable number.

122721865 is a deficient number, since it is larger than the sum of its proper divisors (45582455).

122721865 is an equidigital number, since it uses as much as digits as its factorization.

122721865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3506351.

The product of its digits is 13440, while the sum is 34.

The square root of 122721865 is about 11077.9901155399. The cubic root of 122721865 is about 496.9438445541.

The spelling of 122721865 in words is "one hundred twenty-two million, seven hundred twenty-one thousand, eight hundred sixty-five".