1638122327 has 8 divisors (see below), whose sum is σ = 1653367296. Its totient is φ = 1622914272.

The previous prime is 1638122303. The next prime is 1638122347. The reversal of 1638122327 is 7232218361.

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

It is a cyclic number.

It is not a de Polignac number, because 1638122327 - 2¹⁴ = 1638105943 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 (1638122347) 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, 84293 + ... + 101889.

It is an arithmetic number, because the mean of its divisors is an integer number (206670912).

Almost surely, 2^1638122327 is an apocalyptic number.

1638122327 is a deficient number, since it is larger than the sum of its proper divisors (15244969).

1638122327 is a wasteful number, since it uses less digits than its factorization.

1638122327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18457.

The product of its digits is 24192, while the sum is 35.

The square root of 1638122327 is about 40473.7239082346. The cubic root of 1638122327 is about 1178.8234770992.

The spelling of 1638122327 in words is "one billion, six hundred thirty-eight million, one hundred twenty-two thousand, three hundred twenty-seven".