391642 has 8 divisors (see below), whose sum is σ = 597600. Its totient is φ = 192444.

The previous prime is 391639. The next prime is 391661. The reversal of 391642 is 246193.

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

It is an unprimeable number.

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, 1542 + ... + 1777.

It is an arithmetic number, because the mean of its divisors is an integer number (74700).

2³⁹¹⁶⁴² is an apocalyptic number.

391642 is a deficient number, since it is larger than the sum of its proper divisors (205958).

391642 is a wasteful number, since it uses less digits than its factorization.

391642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3380.

The product of its digits is 1296, while the sum is 25.

The square root of 391642 is about 625.8130711323. The cubic root of 391642 is about 73.1638279683.

It can be divided in two parts, 39 and 1642, that added together give a square (1681 = 41²).

The spelling of 391642 in words is "three hundred ninety-one thousand, six hundred forty-two".