399120212 has 12 divisors (see below), whose sum is σ = 699199956. Its totient is φ = 199348800.

The previous prime is 399120187. The next prime is 399120217. The reversal of 399120212 is 212021993.

It can be written as a sum of positive squares in 2 ways, for example, as 246992656 + 152127556 = 15716^2 + 12334^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399120217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48539 + ... + 56162.

It is an arithmetic number, because the mean of its divisors is an integer number (58266663).

Almost surely, 2^399120212 is an apocalyptic number.

It is an amenable number.

399120212 is a deficient number, since it is larger than the sum of its proper divisors (300079744).

399120212 is a wasteful number, since it uses less digits than its factorization.

399120212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105658 (or 105656 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 399120212 is about 19977.9931925106. The cubic root of 399120212 is about 736.2657087456.

The spelling of 399120212 in words is "three hundred ninety-nine million, one hundred twenty thousand, two hundred twelve".