399397 has 4 divisors (see below), whose sum is σ = 400896. Its totient is φ = 397900.

The previous prime is 399391. The next prime is 399401. The reversal of 399397 is 793993.

It is a happy number.

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 399397 - 2³ = 399389 is a prime.

It is a Duffinian number.

It is a congruent 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 (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 229 + ... + 922.

It is an arithmetic number, because the mean of its divisors is an integer number (100224).

2³⁹⁹³⁹⁷ is an apocalyptic number.

It is an amenable number.

399397 is a deficient number, since it is larger than the sum of its proper divisors (1499).

399397 is a wasteful number, since it uses less digits than its factorization.

399397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1498.

The product of its digits is 45927, while the sum is 40.

The square root of 399397 is about 631.9786388795. The cubic root of 399397 is about 73.6435868358.

The spelling of 399397 in words is "three hundred ninety-nine thousand, three hundred ninety-seven".