391242 has 16 divisors (see below), whose sum is σ = 788832. Its totient is φ = 129360.

The previous prime is 391231. The next prime is 391247. The reversal of 391242 is 242193.

391242 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (391247) 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, 1017 + ... + 1347.

It is an arithmetic number, because the mean of its divisors is an integer number (49302).

2³⁹¹²⁴² is an apocalyptic number.

391242 is an abundant number, since it is smaller than the sum of its proper divisors (397590).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

391242 is a wasteful number, since it uses less digits than its factorization.

391242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533.

The product of its digits is 432, while the sum is 21.

The square root of 391242 is about 625.4934052410. The cubic root of 391242 is about 73.1389110798.

The spelling of 391242 in words is "three hundred ninety-one thousand, two hundred forty-two".