399351 has 4 divisors (see below), whose sum is σ = 532472. Its totient is φ = 266232.

The previous prime is 399283. The next prime is 399353. The reversal of 399351 is 153993.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 399351 - 2¹¹ = 397303 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66556 + ... + 66561.

It is an arithmetic number, because the mean of its divisors is an integer number (133118).

2³⁹⁹³⁵¹ is an apocalyptic number.

399351 is a deficient number, since it is larger than the sum of its proper divisors (133121).

399351 is a wasteful number, since it uses less digits than its factorization.

399351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133120.

The product of its digits is 3645, while the sum is 30.

The square root of 399351 is about 631.9422441964. The cubic root of 399351 is about 73.6407594610.

The spelling of 399351 in words is "three hundred ninety-nine thousand, three hundred fifty-one".