1325631840 has 192 divisors, whose sum is σ = 4540536000. Its totient is φ = 323149824.

The previous prime is 1325631829. The next prime is 1325631859. The reversal of 1325631840 is 481365231.

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, 679186 + ... + 681134.

It is an arithmetic number, because the mean of its divisors is an integer number (23648625).

Almost surely, 2^1325631840 is an apocalyptic number.

1325631840 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 1325631840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2270268000).

1325631840 is an abundant number, since it is smaller than the sum of its proper divisors (3214904160).

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

1325631840 is a wasteful number, since it uses less digits than its factorization.

1325631840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2089 (or 2081 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 1325631840 is about 36409.2274018552. The cubic root of 1325631840 is about 1098.5191754465.

The spelling of 1325631840 in words is "one billion, three hundred twenty-five million, six hundred thirty-one thousand, eight hundred forty".