390646 has 8 divisors (see below), whose sum is σ = 601920. Its totient is φ = 190008.

The previous prime is 390581. The next prime is 390647. The reversal of 390646 is 646093.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390647) 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, 2566 + ... + 2713.

It is an arithmetic number, because the mean of its divisors is an integer number (75240).

2³⁹⁰⁶⁴⁶ is an apocalyptic number.

390646 is a deficient number, since it is larger than the sum of its proper divisors (211274).

390646 is a wasteful number, since it uses less digits than its factorization.

390646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5318.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 390646 is about 625.0167997742. The cubic root of 390646 is about 73.1017533918.

The spelling of 390646 in words is "three hundred ninety thousand, six hundred forty-six".