1311254340 has 48 divisors (see below), whose sum is σ = 4005288000. Its totient is φ = 317879680.

The previous prime is 1311254339. The next prime is 1311254369. The reversal of 1311254340 is 434521131.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1311254340.

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, 992715 + ... + 994034.

It is an arithmetic number, because the mean of its divisors is an integer number (83443500).

Almost surely, 2^1311254340 is an apocalyptic number.

1311254340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311254340 is an abundant number, since it is smaller than the sum of its proper divisors (2694033660).

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

1311254340 is a wasteful number, since it uses less digits than its factorization.

1311254340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1986772 (or 1986770 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 1311254340 is about 36211.2460431839. The cubic root of 1311254340 is about 1094.5333012526.

Adding to 1311254340 its reverse (434521131), we get a palindrome (1745775471).

The spelling of 1311254340 in words is "one billion, three hundred eleven million, two hundred fifty-four thousand, three hundred forty".