1212011988 has 72 divisors (see below), whose sum is σ = 3184466880. Its totient is φ = 358300800.

The previous prime is 1212011987. The next prime is 1212012001. The reversal of 1212011988 is 8891102121.

It is a Harshad number since it is a multiple of its sum of digits (33).

1212011988 is a modest number, since divided by 11988 gives 1212 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212011987) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49353 + ... + 69711.

Almost surely, 2^1212011988 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 1212011988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1592233440).

1212011988 is an abundant number, since it is smaller than the sum of its proper divisors (1972454892).

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

1212011988 is a wasteful number, since it uses less digits than its factorization.

1212011988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20429 (or 20416 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 33.

The square root of 1212011988 is about 34813.9625437841. The cubic root of 1212011988 is about 1066.1925375032.

The spelling of 1212011988 in words is "one billion, two hundred twelve million, eleven thousand, nine hundred eighty-eight".