1222163640 has 96 divisors (see below), whose sum is σ = 4119176880. Its totient is φ = 325907712.

The previous prime is 1222163599. The next prime is 1222163641. The reversal of 1222163640 is 463612221.

1222163640 is a `hidden beast` number, since 1 + 2 + 2 + 2 + 16 + 3 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222163641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53149 + ... + 72588.

Almost surely, 2^1222163640 is an apocalyptic number.

1222163640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1222163640 is an abundant number, since it is smaller than the sum of its proper divisors (2897013240).

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

1222163640 is a wasteful number, since it uses less digits than its factorization.

1222163640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125763 (or 125747 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 1222163640 is about 34959.4570896060. The cubic root of 1222163640 is about 1069.1610274994.

Adding to 1222163640 its reverse (463612221), we get a palindrome (1685775861).

The spelling of 1222163640 in words is "one billion, two hundred twenty-two million, one hundred sixty-three thousand, six hundred forty".