1212816444 has 48 divisors (see below), whose sum is σ = 3300192000. Its totient is φ = 346517808.

The previous prime is 1212816443. The next prime is 1212816461. The reversal of 1212816444 is 4446182121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212816443) 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, 143214 + ... + 151445.

It is an arithmetic number, because the mean of its divisors is an integer number (68754000).

Almost surely, 2^1212816444 is an apocalyptic number.

1212816444 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1212816444 is an abundant number, since it is smaller than the sum of its proper divisors (2087375556).

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

1212816444 is a wasteful number, since it uses less digits than its factorization.

1212816444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294687 (or 294671 counting only the distinct ones).

The product of its digits is 12288, while the sum is 33.

The square root of 1212816444 is about 34825.5142675596. The cubic root of 1212816444 is about 1066.4283754594.

Adding to 1212816444 its reverse (4446182121), we get a palindrome (5658998565).

The spelling of 1212816444 in words is "one billion, two hundred twelve million, eight hundred sixteen thousand, four hundred forty-four".