398725 has 12 divisors (see below), whose sum is σ = 507780. Its totient is φ = 310400.

The previous prime is 398711. The next prime is 398729. The reversal of 398725 is 527893.

398725 = 446² + 447².

It can be written as a sum of positive squares in 6 ways, for example, as 113569 + 285156 = 337^2 + 534^2 .

It is not a de Polignac number, because 398725 - 2⁵ = 398693 is a prime.

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 11 ways as a sum of consecutive naturals, for example, 831 + ... + 1219.

It is an arithmetic number, because the mean of its divisors is an integer number (42315).

398725 is a Friedman number, since it can be written as 5^8+(9*(7+3))^2, using all its digits and the basic arithmetic operations.

2³⁹⁸⁷²⁵ is an apocalyptic number.

398725 is the 447-th centered square number.

It is an amenable number.

398725 is a deficient number, since it is larger than the sum of its proper divisors (109055).

398725 is a wasteful number, since it uses less digits than its factorization.

398725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440 (or 435 counting only the distinct ones).

The product of its digits is 15120, while the sum is 34.

The square root of 398725 is about 631.4467515159. The cubic root of 398725 is about 73.6022609773.

The spelling of 398725 in words is "three hundred ninety-eight thousand, seven hundred twenty-five".