391868 has 6 divisors (see below), whose sum is σ = 685776. Its totient is φ = 195932.

The previous prime is 391861. The next prime is 391873. The reversal of 391868 is 868193.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391861) 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 as a sum of consecutive naturals, namely, 48980 + ... + 48987.

It is an arithmetic number, because the mean of its divisors is an integer number (114296).

2³⁹¹⁸⁶⁸ is an apocalyptic number.

It is an amenable number.

391868 is a deficient number, since it is larger than the sum of its proper divisors (293908).

391868 is a wasteful number, since it uses less digits than its factorization.

391868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97971 (or 97969 counting only the distinct ones).

The product of its digits is 10368, while the sum is 35.

The square root of 391868 is about 625.9936101910. The cubic root of 391868 is about 73.1778985103.

The spelling of 391868 in words is "three hundred ninety-one thousand, eight hundred sixty-eight".