391799 has 8 divisors (see below), whose sum is σ = 437040. Its totient is φ = 349056.

The previous prime is 391789. The next prime is 391801. The reversal of 391799 is 997193.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-391799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 391799.

It is not an unprimeable number, because it can be changed into a prime (391739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 284 + ... + 929.

It is an arithmetic number, because the mean of its divisors is an integer number (54630).

2³⁹¹⁷⁹⁹ is an apocalyptic number.

391799 is a deficient number, since it is larger than the sum of its proper divisors (45241).

391799 is a wasteful number, since it uses less digits than its factorization.

391799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1249.

The product of its digits is 15309, while the sum is 38.

The square root of 391799 is about 625.9384953811. The cubic root of 391799 is about 73.1736032107.

It can be divided in two parts, 3917 and 99, that multiplied together give a palindrome (387783).

The spelling of 391799 in words is "three hundred ninety-one thousand, seven hundred ninety-nine".