1212844864 has 84 divisors (see below), whose sum is σ = 3054278880. Its totient is φ = 472523520.

The previous prime is 1212844861. The next prime is 1212844907. The reversal of 1212844864 is 4684482121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212844861) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16917 + ... + 52075.

Almost surely, 2^1212844864 is an apocalyptic number.

1212844864 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1212844864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1527139440).

1212844864 is an abundant number, since it is smaller than the sum of its proper divisors (1841434016).

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

1212844864 is a wasteful number, since it uses less digits than its factorization.

1212844864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35196 (or 35179 counting only the distinct ones).

The product of its digits is 98304, while the sum is 40.

The square root of 1212844864 is about 34825.9222993448. The cubic root of 1212844864 is about 1066.4367052876.

The spelling of 1212844864 in words is "one billion, two hundred twelve million, eight hundred forty-four thousand, eight hundred sixty-four".