1213871228 has 12 divisors (see below), whose sum is σ = 2127309912. Its totient is φ = 606068400.

The previous prime is 1213871203. The next prime is 1213871249. The reversal of 1213871228 is 8221783121.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213650 + ... + 219257.

It is an arithmetic number, because the mean of its divisors is an integer number (177275826).

Almost surely, 2^1213871228 is an apocalyptic number.

It is an amenable number.

1213871228 is a deficient number, since it is larger than the sum of its proper divisors (913438684).

1213871228 is a wasteful number, since it uses less digits than its factorization.

1213871228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433612 (or 433610 counting only the distinct ones).

The product of its digits is 10752, while the sum is 35.

The square root of 1213871228 is about 34840.6548158900. The cubic root of 1213871228 is about 1066.7374427430.

The spelling of 1213871228 in words is "one billion, two hundred thirteen million, eight hundred seventy-one thousand, two hundred twenty-eight".