398425 has 6 divisors (see below), whose sum is σ = 494078. Its totient is φ = 318720.

The previous prime is 398423. The next prime is 398441. The reversal of 398425 is 524893.

It can be written as a sum of positive squares in 3 ways, for example, as 47961 + 350464 = 219^2 + 592^2 .

It is not a de Polignac number, because 398425 - 2¹ = 398423 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7944 + ... + 7993.

2³⁹⁸⁴²⁵ is an apocalyptic number.

It is an amenable number.

398425 is a deficient number, since it is larger than the sum of its proper divisors (95653).

398425 is a wasteful number, since it uses less digits than its factorization.

398425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15947 (or 15942 counting only the distinct ones).

The product of its digits is 8640, while the sum is 31.

The square root of 398425 is about 631.2091570945. The cubic root of 398425 is about 73.5837969412.

It can be divided in two parts, 39 and 8425, that added together give a square (8464 = 92²).

The spelling of 398425 in words is "three hundred ninety-eight thousand, four hundred twenty-five".