428425 has 6 divisors (see below), whose sum is σ = 531278. Its totient is φ = 342720.

The previous prime is 428411. The next prime is 428429. The reversal of 428425 is 524824.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 4624 + 423801 = 68^2 + 651^2 .

It is not a de Polignac number, because 428425 - 2⁷ = 428297 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 17137 = 428425 / (4 + 2 + 8 + 4 + 2 + 5).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 428425.

It is not an unprimeable number, because it can be changed into a prime (428429) 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, 8544 + ... + 8593.

2⁴²⁸⁴²⁵ is an apocalyptic number.

It is an amenable number.

428425 is a deficient number, since it is larger than the sum of its proper divisors (102853).

428425 is a wasteful number, since it uses less digits than its factorization.

428425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17147 (or 17142 counting only the distinct ones).

The product of its digits is 2560, while the sum is 25.

The square root of 428425 is about 654.5418244849. The cubic root of 428425 is about 75.3861565112.

The spelling of 428425 in words is "four hundred twenty-eight thousand, four hundred twenty-five".