399221939116 has 96 divisors (see below), whose sum is σ = 938775172608. Its totient is φ = 143462568960.

The previous prime is 399221939111. The next prime is 399221939119. The reversal of 399221939116 is 611939122993.

It is a super-2 number, since 2×399221939116² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (399221939111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5098276 + ... + 5175988.

It is an arithmetic number, because the mean of its divisors is an integer number (9778908048).

Almost surely, 2^399221939116 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399221939116, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (469387586304).

399221939116 is an abundant number, since it is smaller than the sum of its proper divisors (539553233492).

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

399221939116 is a wasteful number, since it uses less digits than its factorization.

399221939116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79031 (or 79029 counting only the distinct ones).

The product of its digits is 1417176, while the sum is 55.

The spelling of 399221939116 in words is "three hundred ninety-nine billion, two hundred twenty-one million, nine hundred thirty-nine thousand, one hundred sixteen".