1317780540 has 36 divisors (see below), whose sum is σ = 3997268184. Its totient is φ = 351408096.

The previous prime is 1317780523. The next prime is 1317780557. The reversal of 1317780540 is 450877131.

1317780540 is a `hidden beast` number, since 1 + 31 + 7 + 7 + 80 + 540 = 666.

It is an interprime number because it is at equal distance from previous prime (1317780523) and next prime (1317780557).

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1317780495 and 1317780504.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 3660322 + ... + 3660681.

Almost surely, 2^1317780540 is an apocalyptic number.

1317780540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1317780540 is an abundant number, since it is smaller than the sum of its proper divisors (2679487644).

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

1317780540 is a wasteful number, since it uses less digits than its factorization.

1317780540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7321018 (or 7321013 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 1317780540 is about 36301.2470860162. The cubic root of 1317780540 is about 1096.3461520066.

The spelling of 1317780540 in words is "one billion, three hundred seventeen million, seven hundred eighty thousand, five hundred forty".