391698 has 24 divisors (see below), whose sum is σ = 868608. Its totient is φ = 127512.

The previous prime is 391693. The next prime is 391711. The reversal of 391698 is 896193.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 391698.

It is not an unprimeable number, because it can be changed into a prime (391691) by changing a digit.

391698 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 615 + ... + 1077.

It is an arithmetic number, because the mean of its divisors is an integer number (36192).

2³⁹¹⁶⁹⁸ is an apocalyptic number.

391698 is an abundant number, since it is smaller than the sum of its proper divisors (476910).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

391698 is a wasteful number, since it uses less digits than its factorization.

391698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518 (or 515 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 391698 is about 625.8578113278. The cubic root of 391698 is about 73.1673149787.

It can be divided in two parts, 391 and 698, that added together give a square (1089 = 33²).

The spelling of 391698 in words is "three hundred ninety-one thousand, six hundred ninety-eight".