1321713738 has 48 divisors (see below), whose sum is σ = 2891889000. Its totient is φ = 436256640.

The previous prime is 1321713719. The next prime is 1321713749. The reversal of 1321713738 is 8373171231.

It can be written as a sum of positive squares in 4 ways, for example, as 748733769 + 572979969 = 27363^2 + 23937^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1235868 + ... + 1236936.

Almost surely, 2^1321713738 is an apocalyptic number.

1321713738 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1321713738 is an abundant number, since it is smaller than the sum of its proper divisors (1570175262).

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

1321713738 is a wasteful number, since it uses less digits than its factorization.

1321713738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1687 (or 1684 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 1321713738 is about 36355.3811422738. The cubic root of 1321713738 is about 1097.4358284959.

Adding to 1321713738 its reverse (8373171231), we get a palindrome (9694884969).

The spelling of 1321713738 in words is "one billion, three hundred twenty-one million, seven hundred thirteen thousand, seven hundred thirty-eight".