1644013422 has 40 divisors (see below), whose sum is σ = 3810846600. Its totient is φ = 529106256.

The previous prime is 1644013417. The next prime is 1644013433. The reversal of 1644013422 is 2243104461.

It is a happy number.

1644013422 is a `hidden beast` number, since 1 + 644 + 0 + 13 + 4 + 2 + 2 = 666.

It is a super-3 number, since 3×1644013422³ (a number of 29 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 170272 + ... + 179667.

It is an arithmetic number, because the mean of its divisors is an integer number (95271165).

Almost surely, 2^1644013422 is an apocalyptic number.

1644013422 is an abundant number, since it is smaller than the sum of its proper divisors (2166833178).

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

1644013422 is a wasteful number, since it uses less digits than its factorization.

1644013422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349982 (or 349973 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 1644013422 is about 40546.4353796977. The cubic root of 1644013422 is about 1180.2349005688.

Adding to 1644013422 its reverse (2243104461), we get a palindrome (3887117883).

The spelling of 1644013422 in words is "one billion, six hundred forty-four million, thirteen thousand, four hundred twenty-two".