1638005799 has 8 divisors (see below), whose sum is σ = 2243035120. Its totient is φ = 1062490176.

The previous prime is 1638005783. The next prime is 1638005819. The reversal of 1638005799 is 9975008361.

1638005799 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1638005799 - 2⁴ = 1638005783 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 (1638003799) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7378294 + ... + 7378515.

It is an arithmetic number, because the mean of its divisors is an integer number (280379390).

Almost surely, 2^1638005799 is an apocalyptic number.

1638005799 is a deficient number, since it is larger than the sum of its proper divisors (605029321).

1638005799 is a wasteful number, since it uses less digits than its factorization.

1638005799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14756849.

The product of its (nonzero) digits is 408240, while the sum is 48.

The square root of 1638005799 is about 40472.2843313792. The cubic root of 1638005799 is about 1178.7955245267.

The spelling of 1638005799 in words is "one billion, six hundred thirty-eight million, five thousand, seven hundred ninety-nine".