1222816860 has 72 divisors (see below), whose sum is σ = 3788156736. Its totient is φ = 319144320.

The previous prime is 1222816807. The next prime is 1222816897. The reversal of 1222816860 is 686182221.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63811 + ... + 80730.

It is an arithmetic number, because the mean of its divisors is an integer number (52613288).

Almost surely, 2^1222816860 is an apocalyptic number.

1222816860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1222816860 is an abundant number, since it is smaller than the sum of its proper divisors (2565339876).

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

1222816860 is a wasteful number, since it uses less digits than its factorization.

1222816860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144603 (or 144598 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 1222816860 is about 34968.7983779826. The cubic root of 1222816860 is about 1069.3514747124.

The spelling of 1222816860 in words is "one billion, two hundred twenty-two million, eight hundred sixteen thousand, eight hundred sixty".