2139640243 has 32 divisors (see below), whose sum is σ = 2439557120. Its totient is φ = 1862974080.

The previous prime is 2139640231. The next prime is 2139640249. The reversal of 2139640243 is 3420469312.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2139640243 - 2²¹ = 2137543091 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2139640199 and 2139640208.

It is not an unprimeable number, because it can be changed into a prime (2139640249) 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 31 ways as a sum of consecutive naturals, for example, 2942746 + ... + 2943472.

It is an arithmetic number, because the mean of its divisors is an integer number (76236160).

Almost surely, 2^2139640243 is an apocalyptic number.

2139640243 is a deficient number, since it is larger than the sum of its proper divisors (299916877).

2139640243 is a wasteful number, since it uses less digits than its factorization.

2139640243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 947.

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 2139640243 is about 46256.2454485878. The cubic root of 2139640243 is about 1288.5865260336.

The spelling of 2139640243 in words is "two billion, one hundred thirty-nine million, six hundred forty thousand, two hundred forty-three".