398422723122 has 54 divisors (see below), whose sum is σ = 887431562199. Its totient is φ = 129186044640.

The previous prime is 398422723121. The next prime is 398422723129. The reversal of 398422723122 is 221327224893.

398422723122 is a `hidden beast` number, since 39 + 8 + 422 + 72 + 3 + 122 = 666.

It can be written as a sum of positive squares in 5 ways, for example, as 165762165321 + 232660557801 = 407139^2 + 482349^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=446331.

It is not an unprimeable number, because it can be changed into a prime (398422723121) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 99083472 + ... + 99087492.

Almost surely, 2^398422723122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 398422723122

398422723122 is an abundant number, since it is smaller than the sum of its proper divisors (489008839077).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

398422723122 is an frugal number, since it uses more digits than its factorization.

398422723122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8124 (or 4063 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The spelling of 398422723122 in words is "three hundred ninety-eight billion, four hundred twenty-two million, seven hundred twenty-three thousand, one hundred twenty-two".