1644212022 has 16 divisors (see below), whose sum is σ = 3290166000. Its totient is φ = 547780352.

The previous prime is 1644212021. The next prime is 1644212023. The reversal of 1644212022 is 2202124461.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1644212021) and next prime (1644212023).

It is a super-3 number, since 3×1644212022³ (a number of 29 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1644211983 and 1644212001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644212021) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 60147 + ... + 83102.

It is an arithmetic number, because the mean of its divisors is an integer number (205635375).

Almost surely, 2^1644212022 is an apocalyptic number.

1644212022 is an abundant number, since it is smaller than the sum of its proper divisors (1645953978).

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

1644212022 is a wasteful number, since it uses less digits than its factorization.

1644212022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145167.

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 1644212022 is about 40548.8843496341. The cubic root of 1644212022 is about 1180.2824235412.

Adding to 1644212022 its reverse (2202124461), we get a palindrome (3846336483).

The spelling of 1644212022 in words is "one billion, six hundred forty-four million, two hundred twelve thousand, twenty-two".