399819222 has 24 divisors (see below), whose sum is σ = 945027720. Its totient is φ = 121157280.

The previous prime is 399819197. The next prime is 399819313. The reversal of 399819222 is 222918993.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1009447 + ... + 1009842.

It is an arithmetic number, because the mean of its divisors is an integer number (39376155).

Almost surely, 2^399819222 is an apocalyptic number.

399819222 is an abundant number, since it is smaller than the sum of its proper divisors (545208498).

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

399819222 is a wasteful number, since it uses less digits than its factorization.

399819222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2019308 (or 2019305 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 399819222 is about 19995.4800392489. The cubic root of 399819222 is about 736.6952843611.

It can be divided in two parts, 3998 and 19222, that added together give a triangular number (23220 = T₂₁₅).

The spelling of 399819222 in words is "three hundred ninety-nine million, eight hundred nineteen thousand, two hundred twenty-two".