399212122 has 16 divisors (see below), whose sum is σ = 642072960. Its totient is φ = 185485248.

The previous prime is 399212117. The next prime is 399212131. The reversal of 399212122 is 221212993.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71628 + ... + 76999.

It is an arithmetic number, because the mean of its divisors is an integer number (40129560).

Almost surely, 2^399212122 is an apocalyptic number.

399212122 is a deficient number, since it is larger than the sum of its proper divisors (242860838).

399212122 is a wasteful number, since it uses less digits than its factorization.

399212122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148725.

The product of its digits is 3888, while the sum is 31.

The square root of 399212122 is about 19980.2933411900. The cubic root of 399212122 is about 736.3222205312.

It can be divided in two parts, 399 and 212122, that added together give a square (212521 = 461²).

The spelling of 399212122 in words is "three hundred ninety-nine million, two hundred twelve thousand, one hundred twenty-two".