1638412722 has 12 divisors (see below), whose sum is σ = 3549894270. Its totient is φ = 546137568.

The previous prime is 1638412717. The next prime is 1638412747. The reversal of 1638412722 is 2272148361.

It is a happy number.

1638412722 is a `hidden beast` number, since 1 + 6 + 384 + 1 + 272 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1637092521 + 1320201 = 40461^2 + 1149^2 .

It is a super-2 number, since 2×1638412722² = 5368792495222898568, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 45511447 + ... + 45511482.

Almost surely, 2^1638412722 is an apocalyptic number.

1638412722 is an abundant number, since it is smaller than the sum of its proper divisors (1911481548).

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

1638412722 is a wasteful number, since it uses less digits than its factorization.

1638412722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91022937 (or 91022934 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 1638412722 is about 40477.3112002267. The cubic root of 1638412722 is about 1178.8931308753.

The spelling of 1638412722 in words is "one billion, six hundred thirty-eight million, four hundred twelve thousand, seven hundred twenty-two".