133806388 has 12 divisors (see below), whose sum is σ = 247935492. Its totient is φ = 62967680.

The previous prime is 133806353. The next prime is 133806391. The reversal of 133806388 is 883608331.

It can be written as a sum of positive squares in 2 ways, for example, as 99560484 + 34245904 = 9978^2 + 5852^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 133806388.

It is a congruent number.

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, 983803 + ... + 983938.

It is an arithmetic number, because the mean of its divisors is an integer number (20661291).

Almost surely, 2^133806388 is an apocalyptic number.

It is an amenable number.

133806388 is a deficient number, since it is larger than the sum of its proper divisors (114129104).

133806388 is a wasteful number, since it uses less digits than its factorization.

133806388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1967762 (or 1967760 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 133806388 is about 11567.4711151574. The cubic root of 133806388 is about 511.4764189006.

It can be divided in two parts, 13 and 3806388, that added together give a square (3806401 = 1951²).

The spelling of 133806388 in words is "one hundred thirty-three million, eight hundred six thousand, three hundred eighty-eight".