1312356438 has 32 divisors (see below), whose sum is σ = 2918412000. Its totient is φ = 437142528.

The previous prime is 1312356427. The next prime is 1312356439. The reversal of 1312356438 is 8346532131.

1312356438 is a `hidden beast` number, since 1 + 3 + 1 + 2 + 3 + 5 + 643 + 8 = 666.

1312356438 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312356439) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76038 + ... + 91686.

It is an arithmetic number, because the mean of its divisors is an integer number (91200375).

Almost surely, 2^1312356438 is an apocalyptic number.

1312356438 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1312356438 is an abundant number, since it is smaller than the sum of its proper divisors (1606055562).

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

1312356438 is a wasteful number, since it uses less digits than its factorization.

1312356438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17213 (or 17207 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 1312356438 is about 36226.4604674539. The cubic root of 1312356438 is about 1094.8398639909.

Adding to 1312356438 its reverse (8346532131), we get a palindrome (9658888569).

The spelling of 1312356438 in words is "one billion, three hundred twelve million, three hundred fifty-six thousand, four hundred thirty-eight".