2139726291 has 8 divisors (see below), whose sum is σ = 2853192144. Its totient is φ = 1426372320.

The previous prime is 2139726283. The next prime is 2139726331. The reversal of 2139726291 is 1926279312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2139726291 - 2³ = 2139726283 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2139726221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40845 + ... + 77121.

It is an arithmetic number, because the mean of its divisors is an integer number (356649018).

Almost surely, 2^2139726291 is an apocalyptic number.

2139726291 is a deficient number, since it is larger than the sum of its proper divisors (713465853).

2139726291 is a wasteful number, since it uses less digits than its factorization.

2139726291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55941.

The product of its digits is 81648, while the sum is 42.

The square root of 2139726291 is about 46257.1755622844. The cubic root of 2139726291 is about 1288.6037997797.

The spelling of 2139726291 in words is "two billion, one hundred thirty-nine million, seven hundred twenty-six thousand, two hundred ninety-one".