2139247209 has 12 divisors (see below), whose sum is σ = 3135205808. Its totient is φ = 1296513240.

The previous prime is 2139247199. The next prime is 2139247213. The reversal of 2139247209 is 9027429312.

It is not a de Polignac number, because 2139247209 - 2²⁰ = 2138198633 is a prime.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2139247289) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2946259 + ... + 2946984.

Almost surely, 2^2139247209 is an apocalyptic number.

It is an amenable number.

2139247209 is a deficient number, since it is larger than the sum of its proper divisors (995958599).

2139247209 is a wasteful number, since it uses less digits than its factorization.

2139247209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5893268 (or 5893257 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 39.

The square root of 2139247209 is about 46251.9968109486. The cubic root of 2139247209 is about 1288.5076203496.

The spelling of 2139247209 in words is "two billion, one hundred thirty-nine million, two hundred forty-seven thousand, two hundred nine".