391630 has 8 divisors (see below), whose sum is σ = 704952. Its totient is φ = 156648.

The previous prime is 391627. The next prime is 391631. The reversal of 391630 is 36193.

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 (391631) 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 3 ways as a sum of consecutive naturals, for example, 19572 + ... + 19591.

It is an arithmetic number, because the mean of its divisors is an integer number (88119).

2³⁹¹⁶³⁰ is an apocalyptic number.

391630 is a deficient number, since it is larger than the sum of its proper divisors (313322).

391630 is a wasteful number, since it uses less digits than its factorization.

391630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39170.

The product of its (nonzero) digits is 486, while the sum is 22.

The square root of 391630 is about 625.8034835314. The cubic root of 391630 is about 73.1630807086.

The spelling of 391630 in words is "three hundred ninety-one thousand, six hundred thirty".