1625000440 has 128 divisors (see below), whose sum is σ = 4281154560. Its totient is φ = 543642624.

The previous prime is 1625000389. The next prime is 1625000453. The reversal of 1625000440 is 440005261.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2186709 + ... + 2187451.

It is an arithmetic number, because the mean of its divisors is an integer number (33446520).

Almost surely, 2^1625000440 is an apocalyptic number.

1625000440 is a gapful number since it is divisible by the number (10) 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 1625000440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2140577280).

1625000440 is an abundant number, since it is smaller than the sum of its proper divisors (2656154120).

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

1625000440 is a wasteful number, since it uses less digits than its factorization.

1625000440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 941 (or 937 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 1625000440 is about 40311.2941990207. The cubic root of 1625000440 is about 1175.6674499719.

The spelling of 1625000440 in words is "one billion, six hundred twenty-five million, four hundred forty", and thus it is an aban number.