1212209984 has 56 divisors (see below), whose sum is σ = 2477475360. Its totient is φ = 588059136.

The previous prime is 1212209983. The next prime is 1212209989. The reversal of 1212209984 is 4899022121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212209983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1465379 + ... + 1466205.

Almost surely, 2^1212209984 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1212209984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1238737680).

1212209984 is an abundant number, since it is smaller than the sum of its proper divisors (1265265376).

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

1212209984 is an equidigital number, since it uses as much as digits as its factorization.

1212209984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1495 (or 1485 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 1212209984 is about 34816.8060568456. The cubic root of 1212209984 is about 1066.2505925844.

The spelling of 1212209984 in words is "one billion, two hundred twelve million, two hundred nine thousand, nine hundred eighty-four".