1325331440 has 80 divisors (see below), whose sum is σ = 3138388416. Its totient is φ = 520396800.

The previous prime is 1325331439. The next prime is 1325331463. The reversal of 1325331440 is 441335231.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2004710 + ... + 2005370.

Almost surely, 2^1325331440 is an apocalyptic number.

1325331440 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 1325331440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1569194208).

1325331440 is an abundant number, since it is smaller than the sum of its proper divisors (1813056976).

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

1325331440 is a wasteful number, since it uses less digits than its factorization.

1325331440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1098 (or 1092 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 1325331440 is about 36405.1018402641. The cubic root of 1325331440 is about 1098.4361910964.

Adding to 1325331440 its reverse (441335231), we get a palindrome (1766666671).

The spelling of 1325331440 in words is "one billion, three hundred twenty-five million, three hundred thirty-one thousand, four hundred forty".