391442 has 16 divisors (see below), whose sum is σ = 644760. Its totient is φ = 177408.

The previous prime is 391441. The next prime is 391451. The reversal of 391442 is 244193.

It can be written as a sum of positive squares in 4 ways, for example, as 383161 + 8281 = 619^2 + 91^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 391442.

It is not an unprimeable number, because it can be changed into a prime (391441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 788 + ... + 1184.

2³⁹¹⁴⁴² is an apocalyptic number.

391442 is a deficient number, since it is larger than the sum of its proper divisors (253318).

391442 is a wasteful number, since it uses less digits than its factorization.

391442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445.

The product of its digits is 864, while the sum is 23.

The square root of 391442 is about 625.6532586026. The cubic root of 391442 is about 73.1513716459.

The spelling of 391442 in words is "three hundred ninety-one thousand, four hundred forty-two".