425665240 has 128 divisors (see below), whose sum is σ = 1286046720. Its totient is φ = 122457600.

The previous prime is 425665231. The next prime is 425665249. The reversal of 425665240 is 42566524.

It is an interprime number because it is at equal distance from previous prime (425665231) and next prime (425665249).

It is a junction number, because it is equal to n+sod(n) for n = 425665196 and 425665205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (425665249) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34725 + ... + 45355.

It is an arithmetic number, because the mean of its divisors is an integer number (10047240).

Almost surely, 2^425665240 is an apocalyptic number.

425665240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 425665240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (643023360).

425665240 is an abundant number, since it is smaller than the sum of its proper divisors (860381480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

425665240 is a wasteful number, since it uses less digits than its factorization.

425665240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10673 (or 10669 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 34.

The square root of 425665240 is about 20631.6562592536. The cubic root of 425665240 is about 752.2393750922.

It can be divided in two parts, 4256 and 65240, that added together give a palindrome (69496).

The spelling of 425665240 in words is "four hundred twenty-five million, six hundred sixty-five thousand, two hundred forty".