1383839921 has 2 divisors, whose sum is σ = 1383839922. Its totient is φ = 1383839920.

The previous prime is 1383839861. The next prime is 1383839929. The reversal of 1383839921 is 1299383831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 767013025 + 616826896 = 27695^2 + 24836^2 .

It is a cyclic number.

It is not a de Polignac number, because 1383839921 - 2²⁶ = 1316731057 is a prime.

It is not a weakly prime, because it can be changed into another prime (1383839929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 691919960 + 691919961.

It is an arithmetic number, because the mean of its divisors is an integer number (691919961).

Almost surely, 2^1383839921 is an apocalyptic number.

It is an amenable number.

1383839921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1383839921 is an equidigital number, since it uses as much as digits as its factorization.

1383839921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 47.

The square root of 1383839921 is about 37199.9989381720. The cubic root of 1383839921 is about 1114.3679637035.

The spelling of 1383839921 in words is "one billion, three hundred eighty-three million, eight hundred thirty-nine thousand, nine hundred twenty-one".