1312312240 has 40 divisors (see below), whose sum is σ = 3092935968. Its totient is φ = 517731840.

The previous prime is 1312312139. The next prime is 1312312247. The reversal of 1312312240 is 422132131.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (1312312247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106516 + ... + 118195.

Almost surely, 2^1312312240 is an apocalyptic number.

1312312240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1312312240 is an abundant number, since it is smaller than the sum of its proper divisors (1780623728).

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

1312312240 is a wasteful number, since it uses less digits than its factorization.

1312312240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224797 (or 224791 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1312312240 is about 36225.8504386025. The cubic root of 1312312240 is about 1094.8275730527.

Adding to 1312312240 its reverse (422132131), we get a palindrome (1734444371).

The spelling of 1312312240 in words is "one billion, three hundred twelve million, three hundred twelve thousand, two hundred forty".