391798 has 12 divisors (see below), whose sum is σ = 646380. Its totient is φ = 177980.

The previous prime is 391789. The next prime is 391801. The reversal of 391798 is 897193.

391798 = T₁₂ + T₁₃ + ... + T₁₃₂.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 568 + ... + 1051.

It is an arithmetic number, because the mean of its divisors is an integer number (53865).

2³⁹¹⁷⁹⁸ is an apocalyptic number.

391798 is a deficient number, since it is larger than the sum of its proper divisors (254582).

391798 is a wasteful number, since it uses less digits than its factorization.

391798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1643 (or 1632 counting only the distinct ones).

The product of its digits is 13608, while the sum is 37.

The square root of 391798 is about 625.9376965801. The cubic root of 391798 is about 73.1735409563.

The spelling of 391798 in words is "three hundred ninety-one thousand, seven hundred ninety-eight".