399247 has 4 divisors (see below), whose sum is σ = 420280. Its totient is φ = 378216.

The previous prime is 399241. The next prime is 399263. The reversal of 399247 is 742993.

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

It is a cyclic number.

It is not a de Polignac number, because 399247 - 2³ = 399239 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10488 + ... + 10525.

It is an arithmetic number, because the mean of its divisors is an integer number (105070).

2³⁹⁹²⁴⁷ is an apocalyptic number.

399247 is a deficient number, since it is larger than the sum of its proper divisors (21033).

399247 is a wasteful number, since it uses less digits than its factorization.

399247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21032.

The product of its digits is 13608, while the sum is 34.

The square root of 399247 is about 631.8599528377. The cubic root of 399247 is about 73.6343663349.

It can be divided in two parts, 399 and 247, that added together give a palindrome (646).

The spelling of 399247 in words is "three hundred ninety-nine thousand, two hundred forty-seven".