399001122 has 48 divisors (see below), whose sum is σ = 946298808. Its totient is φ = 120752640.

The previous prime is 399001117. The next prime is 399001133. The reversal of 399001122 is 221100993.

It can be written as a sum of positive squares in 4 ways, for example, as 291692241 + 107308881 = 17079^2 + 10359^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 298 + ... + 28250.

Almost surely, 2^399001122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399001122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (473149404).

399001122 is an abundant number, since it is smaller than the sum of its proper divisors (547297686).

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

399001122 is a wasteful number, since it uses less digits than its factorization.

399001122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28035 (or 28032 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 399001122 is about 19975.0124405468. The cubic root of 399001122 is about 736.1924721593.

The spelling of 399001122 in words is "three hundred ninety-nine million, one thousand, one hundred twenty-two".