398690 has 8 divisors (see below), whose sum is σ = 717660. Its totient is φ = 159472.

The previous prime is 398683. The next prime is 398693. The reversal of 398690 is 96893.

It can be written as a sum of positive squares in 2 ways, for example, as 398161 + 529 = 631^2 + 23^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×398690² = 317907432200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 398690.

It is not an unprimeable number, because it can be changed into a prime (398693) by changing a digit.

398690 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 3 ways as a sum of consecutive naturals, for example, 19925 + ... + 19944.

2³⁹⁸⁶⁹⁰ is an apocalyptic number.

398690 is a deficient number, since it is larger than the sum of its proper divisors (318970).

398690 is a wasteful number, since it uses less digits than its factorization.

398690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39876.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 398690 is about 631.4190367735. The cubic root of 398690 is about 73.6001073171.

The spelling of 398690 in words is "three hundred ninety-eight thousand, six hundred ninety".