391841 has 4 divisors (see below), whose sum is σ = 394800. Its totient is φ = 388884.

The previous prime is 391823. The next prime is 391847. The reversal of 391841 is 148193.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 391841 - 2¹⁴ = 375457 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 391841.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 391841.

It is not an unprimeable number, because it can be changed into a prime (391847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1271 + ... + 1548.

It is an arithmetic number, because the mean of its divisors is an integer number (98700).

2³⁹¹⁸⁴¹ is an apocalyptic number.

It is an amenable number.

391841 is a deficient number, since it is larger than the sum of its proper divisors (2959).

391841 is a wasteful number, since it uses less digits than its factorization.

391841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2958.

The product of its digits is 864, while the sum is 26.

The square root of 391841 is about 625.9720441042. The cubic root of 391841 is about 73.1762178009.

The spelling of 391841 in words is "three hundred ninety-one thousand, eight hundred forty-one".