398709 has 8 divisors (see below), whose sum is σ = 590720. Its totient is φ = 265788.

The previous prime is 398693. The next prime is 398711. The reversal of 398709 is 907893.

It is not a de Polignac number, because 398709 - 2⁴ = 398693 is a prime.

It is a Duffinian number.

398709 is a lucky number.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398729) 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, 7357 + ... + 7410.

It is an arithmetic number, because the mean of its divisors is an integer number (73840).

2³⁹⁸⁷⁰⁹ is an apocalyptic number.

It is an amenable number.

398709 is a deficient number, since it is larger than the sum of its proper divisors (192011).

398709 is a wasteful number, since it uses less digits than its factorization.

398709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14776 (or 14770 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 398709 is about 631.4340820703. The cubic root of 398709 is about 73.6012764626.

The spelling of 398709 in words is "three hundred ninety-eight thousand, seven hundred nine".