399047 has 4 divisors (see below), whose sum is σ = 435336. Its totient is φ = 362760.

The previous prime is 399043. The next prime is 399059. The reversal of 399047 is 740993.

It is a happy number.

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 399047 - 2² = 399043 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18128 + ... + 18149.

It is an arithmetic number, because the mean of its divisors is an integer number (108834).

2³⁹⁹⁰⁴⁷ is an apocalyptic number.

399047 is a deficient number, since it is larger than the sum of its proper divisors (36289).

399047 is a wasteful number, since it uses less digits than its factorization.

399047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36288.

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 399047 is about 631.7016700944. The cubic root of 399047 is about 73.6220687405.

The spelling of 399047 in words is "three hundred ninety-nine thousand, forty-seven".