1212033989 has 4 divisors (see below), whose sum is σ = 1283330124. Its totient is φ = 1140737856.

The previous prime is 1212033961. The next prime is 1212034003. The reversal of 1212033989 is 9893302121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9893302121 = 29 ⋅341148349.

It can be written as a sum of positive squares in 2 ways, for example, as 842740900 + 369293089 = 29030^2 + 19217^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212033989 - 2¹⁶ = 1211968453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212033289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35648042 + ... + 35648075.

It is an arithmetic number, because the mean of its divisors is an integer number (320832531).

Almost surely, 2^1212033989 is an apocalyptic number.

It is an amenable number.

1212033989 is a deficient number, since it is larger than the sum of its proper divisors (71296135).

1212033989 is an equidigital number, since it uses as much as digits as its factorization.

1212033989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71296134.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 1212033989 is about 34814.2785218939. The cubic root of 1212033989 is about 1066.1989888035.

The spelling of 1212033989 in words is "one billion, two hundred twelve million, thirty-three thousand, nine hundred eighty-nine".