425640244 has 12 divisors (see below), whose sum is σ = 758924964. Its totient is φ = 208804544.

The previous prime is 425640227. The next prime is 425640251. The reversal of 425640244 is 442046524.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 247684644 + 177955600 = 15738^2 + 13340^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1003657 + ... + 1004080.

It is an arithmetic number, because the mean of its divisors is an integer number (63243747).

Almost surely, 2^425640244 is an apocalyptic number.

It is an amenable number.

425640244 is a deficient number, since it is larger than the sum of its proper divisors (333284720).

425640244 is a wasteful number, since it uses less digits than its factorization.

425640244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2007794 (or 2007792 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 31.

The square root of 425640244 is about 20631.0504822222. The cubic root of 425640244 is about 752.2246504200.

Adding to 425640244 its reverse (442046524), we get a palindrome (867686768).

The spelling of 425640244 in words is "four hundred twenty-five million, six hundred forty thousand, two hundred forty-four".