1325297920 has 72 divisors (see below), whose sum is σ = 3189424896. Its totient is φ = 527628288.

The previous prime is 1325297891. The next prime is 1325297923. The reversal of 1325297920 is 297925231.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (1325297923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 283119 + ... + 287761.

It is an arithmetic number, because the mean of its divisors is an integer number (44297568).

Almost surely, 2^1325297920 is an apocalyptic number.

1325297920 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 1325297920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1594712448).

1325297920 is an abundant number, since it is smaller than the sum of its proper divisors (1864126976).

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

1325297920 is an equidigital number, since it uses as much as digits as its factorization.

1325297920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4887 (or 4873 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 1325297920 is about 36404.6414623191. The cubic root of 1325297920 is about 1098.4269305471.

The spelling of 1325297920 in words is "one billion, three hundred twenty-five million, two hundred ninety-seven thousand, nine hundred twenty".