399361 has 4 divisors (see below), whose sum is σ = 420400. Its totient is φ = 378324.

The previous prime is 399353. The next prime is 399379. The reversal of 399361 is 163993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 399361 - 2³ = 399353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10491 + ... + 10528.

It is an arithmetic number, because the mean of its divisors is an integer number (105100).

It is a Proth number, since it is equal to 195 ⋅ 2¹¹ + 1 and 195 < 2¹¹.

2³⁹⁹³⁶¹ is an apocalyptic number.

It is an amenable number.

399361 is a deficient number, since it is larger than the sum of its proper divisors (21039).

399361 is a wasteful number, since it uses less digits than its factorization.

399361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21038.

The product of its digits is 4374, while the sum is 31.

The square root of 399361 is about 631.9501562623. The cubic root of 399361 is about 73.6413741262.

The spelling of 399361 in words is "three hundred ninety-nine thousand, three hundred sixty-one".