2001138788 has 12 divisors (see below), whose sum is σ = 3820355952. Its totient is φ = 909608520.

The previous prime is 2001138757. The next prime is 2001138793. The reversal of 2001138788 is 8878311002.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 22740170 + ... + 22740257.

It is an arithmetic number, because the mean of its divisors is an integer number (318362996).

Almost surely, 2^2001138788 is an apocalyptic number.

It is an amenable number.

2001138788 is a deficient number, since it is larger than the sum of its proper divisors (1819217164).

2001138788 is a wasteful number, since it uses less digits than its factorization.

2001138788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45480442 (or 45480440 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 38.

The square root of 2001138788 is about 44734.0897750250. The cubic root of 2001138788 is about 1260.1601350182.

The spelling of 2001138788 in words is "two billion, one million, one hundred thirty-eight thousand, seven hundred eighty-eight".