1310805840 has 80 divisors (see below), whose sum is σ = 4066989696. Its totient is φ = 349248000.

The previous prime is 1310805833. The next prime is 1310805863. The reversal of 1310805840 is 485080131.

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

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1310805798 and 1310805807.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 512565 + ... + 515115.

Almost surely, 2^1310805840 is an apocalyptic number.

1310805840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1310805840 is an abundant number, since it is smaller than the sum of its proper divisors (2756183856).

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

1310805840 is a wasteful number, since it uses less digits than its factorization.

1310805840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4708 (or 4702 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 1310805840 is about 36205.0526860547. The cubic root of 1310805840 is about 1094.4084960311.

Adding to 1310805840 its reverse (485080131), we get a palindrome (1795885971).

The spelling of 1310805840 in words is "one billion, three hundred ten million, eight hundred five thousand, eight hundred forty".