2691871938 has 54 divisors (see below), whose sum is σ = 6788501811. Its totient is φ = 768666024.

The previous prime is 2691871921. The next prime is 2691871943. The reversal of 2691871938 is 8391781962.

It can be written as a sum of positive squares in only one way, i.e., 1345935969 + 1345935969 = 36687^2 + 36687^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=36687.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1539981 + ... + 1541727.

Almost surely, 2^2691871938 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2691871938

2691871938 is an abundant number, since it is smaller than the sum of its proper divisors (4096629873).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2691871938 is an equidigital number, since it uses as much as digits as its factorization.

2691871938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3516 (or 1759 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The square root of 2691871938 is about 51883.2529627817. The cubic root of 2691871938 is about 1391.0779447844.

The spelling of 2691871938 in words is "two billion, six hundred ninety-one million, eight hundred seventy-one thousand, nine hundred thirty-eight".