1300021839 has 16 divisors (see below), whose sum is σ = 1945817440. Its totient is φ = 857744640.

The previous prime is 1300021829. The next prime is 1300021873. The reversal of 1300021839 is 9381200031.

It is not a de Polignac number, because 1300021839 - 2⁷ = 1300021711 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1300021829) 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 in 15 ways as a sum of consecutive naturals, for example, 245572 + ... + 250809.

It is an arithmetic number, because the mean of its divisors is an integer number (121613590).

Almost surely, 2^1300021839 is an apocalyptic number.

1300021839 is a deficient number, since it is larger than the sum of its proper divisors (645795601).

1300021839 is an equidigital number, since it uses as much as digits as its factorization.

1300021839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496487 (or 496481 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 1300021839 is about 36055.8156058076. The cubic root of 1300021839 is about 1091.3989945472.

It can be divided in two parts, 130002 and 1839, that added together give a triangular number (131841 = T₅₁₃).

The spelling of 1300021839 in words is "one billion, three hundred million, twenty-one thousand, eight hundred thirty-nine".