399412 has 12 divisors (see below), whose sum is σ = 752836. Its totient is φ = 184320.

The previous prime is 399409. The next prime is 399433. The reversal of 399412 is 214993.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 163216 + 236196 = 404^2 + 486^2 .

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3789 + ... + 3892.

2³⁹⁹⁴¹² is an apocalyptic number.

It is an amenable number.

399412 is a deficient number, since it is larger than the sum of its proper divisors (353424).

399412 is a wasteful number, since it uses less digits than its factorization.

399412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7698 (or 7696 counting only the distinct ones).

The product of its digits is 1944, while the sum is 28.

The square root of 399412 is about 631.9905062578. The cubic root of 399412 is about 73.6445087589.

The spelling of 399412 in words is "three hundred ninety-nine thousand, four hundred twelve".