428939425 has 24 divisors (see below), whose sum is σ = 540056952. Its totient is φ = 337920000.

The previous prime is 428939387. The next prime is 428939447. The reversal of 428939425 is 524939824.

It can be written as a sum of positive squares in 12 ways, for example, as 25411681 + 403527744 = 5041^2 + 20088^2 .

It is not a de Polignac number, because 428939425 - 2¹⁵ = 428906657 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 648595 + ... + 649255.

It is an arithmetic number, because the mean of its divisors is an integer number (22502373).

Almost surely, 2^428939425 is an apocalyptic number.

It is an amenable number.

428939425 is a deficient number, since it is larger than the sum of its proper divisors (111117527).

428939425 is a wasteful number, since it uses less digits than its factorization.

428939425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1029 (or 1024 counting only the distinct ones).

The product of its digits is 622080, while the sum is 46.

The square root of 428939425 is about 20710.8528313056. The cubic root of 428939425 is about 754.1631738118.

The spelling of 428939425 in words is "four hundred twenty-eight million, nine hundred thirty-nine thousand, four hundred twenty-five".