1209840212 has 24 divisors (see below), whose sum is σ = 2503119360. Its totient is φ = 500623200.

The previous prime is 1209840211. The next prime is 1209840223. The reversal of 1209840212 is 2120489021.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1209840211) 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, 744164 + ... + 745787.

It is an arithmetic number, because the mean of its divisors is an integer number (104296640).

Almost surely, 2^1209840212 is an apocalyptic number.

It is an amenable number.

1209840212 is an abundant number, since it is smaller than the sum of its proper divisors (1293279148).

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

1209840212 is a wasteful number, since it uses less digits than its factorization.

1209840212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1489991 (or 1489989 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 1209840212 is about 34782.7573950082. The cubic root of 1209840212 is about 1065.5553282416. Note that the first 3 decimals are identical.

The spelling of 1209840212 in words is "one billion, two hundred nine million, eight hundred forty thousand, two hundred twelve".