2129906826 has 20 divisors (see below), whose sum is σ = 4772569362. Its totient is φ = 709968888.

The previous prime is 2129906809. The next prime is 2129906839. The reversal of 2129906826 is 6286099212.

It can be written as a sum of positive squares in only one way, i.e., 1576010601 + 553896225 = 39699^2 + 23535^2 .

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

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 9 ways as a sum of consecutive naturals, for example, 6573625 + ... + 6573948.

Almost surely, 2^2129906826 is an apocalyptic number.

2129906826 is an abundant number, since it is smaller than the sum of its proper divisors (2642662536).

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

2129906826 is a wasteful number, since it uses less digits than its factorization.

2129906826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13147587 (or 13147578 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 2129906826 is about 46150.9135987577. The cubic root of 2129906826 is about 1286.6295900467.

The spelling of 2129906826 in words is "two billion, one hundred twenty-nine million, nine hundred six thousand, eight hundred twenty-six".