698391 has 12 divisors (see below), whose sum is σ = 1023568. Its totient is φ = 458784.

The previous prime is 698387. The next prime is 698393. The reversal of 698391 is 193896.

It is not a de Polignac number, because 698391 - 2² = 698387 is a prime.

It is a Duffinian number.

698391 is a lucky 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 698391.

It is not an unprimeable number, because it can be changed into a prime (698393) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 126 + ... + 1188.

2⁶⁹⁸³⁹¹ is an apocalyptic number.

698391 is a deficient number, since it is larger than the sum of its proper divisors (325177).

698391 is a wasteful number, since it uses less digits than its factorization.

698391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1142 (or 1139 counting only the distinct ones).

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

The square root of 698391 is about 835.6979119275. The cubic root of 698391 is about 88.7223176244.

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

The spelling of 698391 in words is "six hundred ninety-eight thousand, three hundred ninety-one".