398718 has 24 divisors (see below), whose sum is σ = 915408. Its totient is φ = 124992.

The previous prime is 398711. The next prime is 398729. The reversal of 398718 is 817893.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398711) by changing a digit.

398718 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 346 + ... + 957.

It is an arithmetic number, because the mean of its divisors is an integer number (38142).

2³⁹⁸⁷¹⁸ is an apocalyptic number.

398718 is an abundant number, since it is smaller than the sum of its proper divisors (516690).

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

398718 is a wasteful number, since it uses less digits than its factorization.

398718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1328 (or 1325 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 398718 is about 631.4412086647. The cubic root of 398718 is about 73.6018302554.

It can be divided in two parts, 3987 and 18, that added together give a triangular number (4005 = T₈₉).

The spelling of 398718 in words is "three hundred ninety-eight thousand, seven hundred eighteen".