1321768538 has 8 divisors (see below), whose sum is σ = 2036238132. Its totient is φ = 643022496.

The previous prime is 1321768523. The next prime is 1321768543. The reversal of 1321768538 is 8358671231.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1314570049 + 7198489 = 36257^2 + 2683^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8930795 + ... + 8930942.

Almost surely, 2^1321768538 is an apocalyptic number.

1321768538 is a deficient number, since it is larger than the sum of its proper divisors (714469594).

1321768538 is a wasteful number, since it uses less digits than its factorization.

1321768538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17861776.

The product of its digits is 241920, while the sum is 44.

The square root of 1321768538 is about 36356.1348055593. The cubic root of 1321768538 is about 1097.4509953334.

The spelling of 1321768538 in words is "one billion, three hundred twenty-one million, seven hundred sixty-eight thousand, five hundred thirty-eight".