1209912220 has 48 divisors (see below), whose sum is σ = 2809806048. Its totient is φ = 433935360.

The previous prime is 1209912181. The next prime is 1209912227. The reversal of 1209912220 is 222199021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1209912227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21609 + ... + 53728.

It is an arithmetic number, because the mean of its divisors is an integer number (58537626).

Almost surely, 2^1209912220 is an apocalyptic number.

1209912220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1209912220 is an abundant number, since it is smaller than the sum of its proper divisors (1599893828).

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

1209912220 is a wasteful number, since it uses less digits than its factorization.

1209912220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75430 (or 75428 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 1209912220 is about 34783.7924901814. The cubic root of 1209912220 is about 1065.5764679439.

The spelling of 1209912220 in words is "one billion, two hundred nine million, nine hundred twelve thousand, two hundred twenty".