1315780440 has 64 divisors (see below), whose sum is σ = 4250988000. Its totient is φ = 323884032.

The previous prime is 1315780393. The next prime is 1315780447. The reversal of 1315780440 is 440875131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1315780447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 420165 + ... + 423284.

Almost surely, 2^1315780440 is an apocalyptic number.

1315780440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1315780440 is an abundant number, since it is smaller than the sum of its proper divisors (2935207560).

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

1315780440 is a wasteful number, since it uses less digits than its factorization.

1315780440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843476 (or 843472 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 1315780440 is about 36273.6879845433. The cubic root of 1315780440 is about 1095.7912006560.

The spelling of 1315780440 in words is "one billion, three hundred fifteen million, seven hundred eighty thousand, four hundred forty".