390947 has 4 divisors (see below), whose sum is σ = 393456. Its totient is φ = 388440.

The previous prime is 390893. The next prime is 390953. The reversal of 390947 is 749093.

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 390947 - 2⁶ = 390883 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 390947.

It is not an unprimeable number, because it can be changed into a prime (390967) 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, 1004 + ... + 1337.

It is an arithmetic number, because the mean of its divisors is an integer number (98364).

2³⁹⁰⁹⁴⁷ is an apocalyptic number.

390947 is a deficient number, since it is larger than the sum of its proper divisors (2509).

390947 is a wasteful number, since it uses less digits than its factorization.

390947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2508.

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

The square root of 390947 is about 625.2575469357. The cubic root of 390947 is about 73.1205239913.

The spelling of 390947 in words is "three hundred ninety thousand, nine hundred forty-seven".