425640 has 32 divisors (see below), whose sum is σ = 1277280. Its totient is φ = 113472.

The previous prime is 425609. The next prime is 425641. The reversal of 425640 is 46524.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (425641) by changing a digit.

425640 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 7 ways as a sum of consecutive naturals, for example, 1654 + ... + 1893.

It is an arithmetic number, because the mean of its divisors is an integer number (39915).

2⁴²⁵⁶⁴⁰ is an apocalyptic number.

425640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

425640 is an abundant number, since it is smaller than the sum of its proper divisors (851640).

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

425640 is a wasteful number, since it uses less digits than its factorization.

425640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3561 (or 3557 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 425640 is about 652.4109134587. The cubic root of 425640 is about 75.2224506681. Note that the first 3 decimals are identical.

The spelling of 425640 in words is "four hundred twenty-five thousand, six hundred forty".