391742 has 24 divisors (see below), whose sum is σ = 680760. Its totient is φ = 168480.

The previous prime is 391739. The next prime is 391751. The reversal of 391742 is 247193.

It is a Harshad number since it is a multiple of its sum of digits (26).

Its product of digits (1512) is a multiple of the sum of its prime factors (108).

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 6392 + ... + 6452.

It is an arithmetic number, because the mean of its divisors is an integer number (28365).

2³⁹¹⁷⁴² is an apocalyptic number.

391742 is a deficient number, since it is larger than the sum of its proper divisors (289018).

391742 is a wasteful number, since it uses less digits than its factorization.

391742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108 (or 95 counting only the distinct ones).

The product of its digits is 1512, while the sum is 26.

The square root of 391742 is about 625.8929620950. The cubic root of 391742 is about 73.1700545394.

The spelling of 391742 in words is "three hundred ninety-one thousand, seven hundred forty-two".