2139013865 has 16 divisors (see below), whose sum is σ = 2719277568. Its totient is φ = 1609679616.

The previous prime is 2139013843. The next prime is 2139013867. The reversal of 2139013865 is 5683109312.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2139013865 - 2²⁶ = 2071905001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2139013867) 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, 181544 + ... + 192966.

It is an arithmetic number, because the mean of its divisors is an integer number (169954848).

Almost surely, 2^2139013865 is an apocalyptic number.

It is an amenable number.

2139013865 is a deficient number, since it is larger than the sum of its proper divisors (580263703).

2139013865 is a wasteful number, since it uses less digits than its factorization.

2139013865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13648.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 2139013865 is about 46249.4742132275. The cubic root of 2139013865 is about 1288.4607695301.

The spelling of 2139013865 in words is "two billion, one hundred thirty-nine million, thirteen thousand, eight hundred sixty-five".