1221862852 has 24 divisors (see below), whose sum is σ = 2467926720. Its totient is φ = 518469600.

The previous prime is 1221862847. The next prime is 1221862871. The reversal of 1221862852 is 2582681221.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213202 + ... + 218857.

It is an arithmetic number, because the mean of its divisors is an integer number (102830280).

Almost surely, 2^1221862852 is an apocalyptic number.

It is an amenable number.

1221862852 is an abundant number, since it is smaller than the sum of its proper divisors (1246063868).

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

1221862852 is a wasteful number, since it uses less digits than its factorization.

1221862852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432171 (or 432169 counting only the distinct ones).

The product of its digits is 30720, while the sum is 37.

The square root of 1221862852 is about 34955.1548702048. The cubic root of 1221862852 is about 1069.0733095151.

The spelling of 1221862852 in words is "one billion, two hundred twenty-one million, eight hundred sixty-two thousand, eight hundred fifty-two".