1638222236 has 12 divisors (see below), whose sum is σ = 3276444528. Its totient is φ = 702095232.

The previous prime is 1638222197. The next prime is 1638222241. The reversal of 1638222236 is 6322228361.

1638222236 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 1638222196 and 1638222205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29253941 + ... + 29253996.

It is an arithmetic number, because the mean of its divisors is an integer number (273037044).

Almost surely, 2^1638222236 is an apocalyptic number.

It is an amenable number.

1638222236 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1638222236 is a wasteful number, since it uses less digits than its factorization.

1638222236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58507948 (or 58507946 counting only the distinct ones).

The product of its digits is 41472, while the sum is 35.

The square root of 1638222236 is about 40474.9581346294. The cubic root of 1638222236 is about 1178.8474420739.

The spelling of 1638222236 in words is "one billion, six hundred thirty-eight million, two hundred twenty-two thousand, two hundred thirty-six".