399737 has 8 divisors (see below), whose sum is σ = 436296. Its totient is φ = 364032.

The previous prime is 399731. The next prime is 399739. The reversal of 399737 is 737993.

It can be written as a sum of positive squares in 4 ways, for example, as 4096 + 395641 = 64^2 + 629^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 399737 - 2⁸ = 399481 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 399737.

It is not an unprimeable number, because it can be changed into a prime (399731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1103 + ... + 1419.

It is an arithmetic number, because the mean of its divisors is an integer number (54537).

2³⁹⁹⁷³⁷ is an apocalyptic number.

It is an amenable number.

399737 is a deficient number, since it is larger than the sum of its proper divisors (36559).

399737 is a wasteful number, since it uses less digits than its factorization.

399737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427.

The product of its digits is 35721, while the sum is 38.

The square root of 399737 is about 632.2475780895. The cubic root of 399737 is about 73.6644780943.

The spelling of 399737 in words is "three hundred ninety-nine thousand, seven hundred thirty-seven".