638740183 has 4 divisors (see below), whose sum is σ = 644941648. Its totient is φ = 632538720.

The previous prime is 638740181. The next prime is 638740229. The reversal of 638740183 is 381047836.

638740183 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 638740183 - 2¹ = 638740181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638740181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3100578 + ... + 3100783.

It is an arithmetic number, because the mean of its divisors is an integer number (161235412).

Almost surely, 2^638740183 is an apocalyptic number.

638740183 is a deficient number, since it is larger than the sum of its proper divisors (6201465).

638740183 is a wasteful number, since it uses less digits than its factorization.

638740183 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6201464.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 638740183 is about 25273.3096961993. The cubic root of 638740183 is about 861.2080476109.

The spelling of 638740183 in words is "six hundred thirty-eight million, seven hundred forty thousand, one hundred eighty-three".