390687 has 8 divisors (see below), whose sum is σ = 568320. Its totient is φ = 236760.

The previous prime is 390673. The next prime is 390703. The reversal of 390687 is 786093.

It is a happy number.

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

It is not a de Polignac number, because 390687 - 2⁴ = 390671 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 11839 = 390687 / (3 + 9 + 0 + 6 + 8 + 7).

390687 is a lucky 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 390687.

It is not an unprimeable number, because it can be changed into a prime (390647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5887 + ... + 5952.

It is an arithmetic number, because the mean of its divisors is an integer number (71040).

2³⁹⁰⁶⁸⁷ is an apocalyptic number.

390687 is a deficient number, since it is larger than the sum of its proper divisors (177633).

390687 is a wasteful number, since it uses less digits than its factorization.

390687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11853.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 390687 is about 625.0495980320. The cubic root of 390687 is about 73.1043107515.

It can be divided in two parts, 3906 and 87, that added together give a palindrome (3993).

The spelling of 390687 in words is "three hundred ninety thousand, six hundred eighty-seven".