398769 has 16 divisors (see below), whose sum is σ = 643968. Its totient is φ = 214272.

The previous prime is 398759. The next prime is 398771. The reversal of 398769 is 967893.

It is a happy number.

It is not a de Polignac number, because 398769 - 2¹² = 394673 is a prime.

It is a super-2 number, since 2×398769² = 318033430722, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 398769.

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 15 ways as a sum of consecutive naturals, for example, 202 + ... + 915.

It is an arithmetic number, because the mean of its divisors is an integer number (40248).

2³⁹⁸⁷⁶⁹ is an apocalyptic number.

It is an amenable number.

398769 is a deficient number, since it is larger than the sum of its proper divisors (245199).

398769 is a wasteful number, since it uses less digits than its factorization.

398769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1144.

The product of its digits is 81648, while the sum is 42.

The square root of 398769 is about 631.4815911806. The cubic root of 398769 is about 73.6049682571.

The spelling of 398769 in words is "three hundred ninety-eight thousand, seven hundred sixty-nine".