391047 has 4 divisors (see below), whose sum is σ = 521400. Its totient is φ = 260696.

The previous prime is 391031. The next prime is 391049. The reversal of 391047 is 740193.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 740193 = 3 ⋅246731.

It is a cyclic number.

It is not a de Polignac number, because 391047 - 2⁴ = 391031 is a prime.

It is a D-number.

391047 is a lucky number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391049) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 65172 + ... + 65177.

It is an arithmetic number, because the mean of its divisors is an integer number (130350).

2³⁹¹⁰⁴⁷ is an apocalyptic number.

391047 is a deficient number, since it is larger than the sum of its proper divisors (130353).

391047 is a wasteful number, since it uses less digits than its factorization.

391047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130352.

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 391047 is about 625.3375088702. The cubic root of 391047 is about 73.1267579386.

The spelling of 391047 in words is "three hundred ninety-one thousand, forty-seven".