1638238822 has 32 divisors (see below), whose sum is σ = 2700578304. Its totient is φ = 739173600.

The previous prime is 1638238817. The next prime is 1638238829. The reversal of 1638238822 is 2288328361.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1638238829) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2672188 + ... + 2672800.

It is an arithmetic number, because the mean of its divisors is an integer number (84393072).

Almost surely, 2^1638238822 is an apocalyptic number.

1638238822 is a deficient number, since it is larger than the sum of its proper divisors (1062339482).

1638238822 is a wasteful number, since it uses less digits than its factorization.

1638238822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1324.

The product of its digits is 221184, while the sum is 43.

The square root of 1638238822 is about 40475.1630262313. The cubic root of 1638238822 is about 1178.8514204307.

The spelling of 1638238822 in words is "one billion, six hundred thirty-eight million, two hundred thirty-eight thousand, eight hundred twenty-two".