391934 has 4 divisors (see below), whose sum is σ = 587904. Its totient is φ = 195966.

The previous prime is 391921. The next prime is 391939. The reversal of 391934 is 439193.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 439193 = 199 ⋅2207.

It is a super-2 number, since 2×391934² = 307224520712, which contains 22 as substring.

It is an Ulam number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 391897 and 391906.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 97982 + ... + 97985.

It is an arithmetic number, because the mean of its divisors is an integer number (146976).

2³⁹¹⁹³⁴ is an apocalyptic number.

391934 is a deficient number, since it is larger than the sum of its proper divisors (195970).

391934 is a wasteful number, since it uses less digits than its factorization.

391934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195969.

The product of its digits is 2916, while the sum is 29.

The square root of 391934 is about 626.0463241646. The cubic root of 391934 is about 73.1820065860.

The spelling of 391934 in words is "three hundred ninety-one thousand, nine hundred thirty-four".