1313211440 has 40 divisors (see below), whose sum is σ = 3057878688. Its totient is φ = 524482560.

The previous prime is 1313211421. The next prime is 1313211469. The reversal of 1313211440 is 441123131.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×1313211440² = 3449048572293747200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41645 + ... + 66035.

Almost surely, 2^1313211440 is an apocalyptic number.

1313211440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1313211440 is an abundant number, since it is smaller than the sum of its proper divisors (1744667248).

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

1313211440 is a wasteful number, since it uses less digits than its factorization.

1313211440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25077 (or 25071 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 1313211440 is about 36238.2593400952. The cubic root of 1313211440 is about 1095.0775755942.

Adding to 1313211440 its reverse (441123131), we get a palindrome (1754334571).

The spelling of 1313211440 in words is "one billion, three hundred thirteen million, two hundred eleven thousand, four hundred forty".