399457 has 4 divisors (see below), whose sum is σ = 401940. Its totient is φ = 396976.

The previous prime is 399439. The next prime is 399473. The reversal of 399457 is 754993.

399457 is nontrivially palindromic in base 8.

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

It can be written as a sum of positive squares in 2 ways, for example, as 349281 + 50176 = 591^2 + 224^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399457 is a prime.

It is a d-powerful number, because it can be written as 3¹⁰ + 9 + 4⁹ + 9² + 5⁷ + 7² .

It is a Duffinian number.

399457 is an undulating number in base 8.

It is not an unprimeable number, because it can be changed into a prime (399557) by changing a digit.

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, 982 + ... + 1327.

It is an arithmetic number, because the mean of its divisors is an integer number (100485).

2³⁹⁹⁴⁵⁷ is an apocalyptic number.

It is an amenable number.

399457 is a deficient number, since it is larger than the sum of its proper divisors (2483).

399457 is a wasteful number, since it uses less digits than its factorization.

399457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2482.

The product of its digits is 34020, while the sum is 37.

The square root of 399457 is about 632.0261070557. The cubic root of 399457 is about 73.6472743898.

The spelling of 399457 in words is "three hundred ninety-nine thousand, four hundred fifty-seven".