391938 has 8 divisors (see below), whose sum is σ = 783888. Its totient is φ = 130644.

The previous prime is 391921. The next prime is 391939. The reversal of 391938 is 839193.

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

391938 is an admirable number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 391899 and 391908.

It is not an unprimeable number, because it can be changed into a prime (391939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32656 + ... + 32667.

It is an arithmetic number, because the mean of its divisors is an integer number (97986).

2³⁹¹⁹³⁸ is an apocalyptic number.

391938 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

391938 is a wasteful number, since it uses less digits than its factorization.

391938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65328.

The product of its digits is 5832, while the sum is 33.

The square root of 391938 is about 626.0495188082. The cubic root of 391938 is about 73.1822555454.

The spelling of 391938 in words is "three hundred ninety-one thousand, nine hundred thirty-eight".