1300005639 has 16 divisors (see below), whose sum is σ = 1926950400. Its totient is φ = 866213208.

The previous prime is 1300005611. The next prime is 1300005653. The reversal of 1300005639 is 9365000031.

It is not a de Polignac number, because 1300005639 - 2²⁹ = 763134727 is a prime.

It is a super-2 number, since 2×1300005639² = 3380029322863596642, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1300005689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44032 + ... + 67370.

It is an arithmetic number, because the mean of its divisors is an integer number (120434400).

Almost surely, 2^1300005639 is an apocalyptic number.

1300005639 is a deficient number, since it is larger than the sum of its proper divisors (626944761).

1300005639 is a wasteful number, since it uses less digits than its factorization.

1300005639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25411 (or 25405 counting only the distinct ones).

The product of its (nonzero) digits is 2430, while the sum is 27.

The square root of 1300005639 is about 36055.5909534153. The cubic root of 1300005639 is about 1091.3944611010.

The spelling of 1300005639 in words is "one billion, three hundred million, five thousand, six hundred thirty-nine".