1321383688 has 16 divisors (see below), whose sum is σ = 2491918380. Its totient is φ = 656872128.

The previous prime is 1321383677. The next prime is 1321383689. The reversal of 1321383688 is 8863831231.

It can be written as a sum of positive squares in 2 ways, for example, as 1313192644 + 8191044 = 36238^2 + 2862^2 .

It is not an unprimeable number, because it can be changed into a prime (1321383689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 475995 + ... + 478762.

Almost surely, 2^1321383688 is an apocalyptic number.

It is an amenable number.

1321383688 is a deficient number, since it is larger than the sum of its proper divisors (1170534692).

1321383688 is a wasteful number, since it uses less digits than its factorization.

1321383688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 954936 (or 954932 counting only the distinct ones).

The product of its digits is 165888, while the sum is 43.

The square root of 1321383688 is about 36350.8416408754. The cubic root of 1321383688 is about 1097.3444726452.

The spelling of 1321383688 in words is "one billion, three hundred twenty-one million, three hundred eighty-three thousand, six hundred eighty-eight".