2649139923 has 32 divisors (see below), whose sum is σ = 3757731840. Its totient is φ = 1655402400.

The previous prime is 2649139901. The next prime is 2649139951. The reversal of 2649139923 is 3299319462.

It is not a de Polignac number, because 2649139923 - 2⁵ = 2649139891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2649139973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2986186 + ... + 2987072.

It is an arithmetic number, because the mean of its divisors is an integer number (117429120).

Almost surely, 2^2649139923 is an apocalyptic number.

2649139923 is a deficient number, since it is larger than the sum of its proper divisors (1108591917).

2649139923 is a wasteful number, since it uses less digits than its factorization.

2649139923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1407.

The product of its digits is 629856, while the sum is 48.

The square root of 2649139923 is about 51469.7962206963. The cubic root of 2649139923 is about 1383.6777769786.

The spelling of 2649139923 in words is "two billion, six hundred forty-nine million, one hundred thirty-nine thousand, nine hundred twenty-three".