1312150440 has 128 divisors (see below), whose sum is σ = 4179600000. Its totient is φ = 328409088.

The previous prime is 1312150387. The next prime is 1312150481. The reversal of 1312150440 is 440512131.

1312150440 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1017316 + ... + 1018604.

It is an arithmetic number, because the mean of its divisors is an integer number (32653125).

Almost surely, 2^1312150440 is an apocalyptic number.

1312150440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1312150440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2089800000).

1312150440 is an abundant number, since it is smaller than the sum of its proper divisors (2867449560).

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

1312150440 is a wasteful number, since it uses less digits than its factorization.

1312150440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1819 (or 1815 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1312150440 is about 36223.6171578709. The cubic root of 1312150440 is about 1094.7825760424.

Adding to 1312150440 its reverse (440512131), we get a palindrome (1752662571).

The spelling of 1312150440 in words is "one billion, three hundred twelve million, one hundred fifty thousand, four hundred forty".