1221743682 has 32 divisors (see below), whose sum is σ = 2716516800. Its totient is φ = 407018304.

The previous prime is 1221743657. The next prime is 1221743689. The reversal of 1221743682 is 2863471221.

It is a happy number.

1221743682 is a `hidden beast` number, since 1 + 2 + 217 + 436 + 8 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (1221743689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109653 + ... + 120279.

It is an arithmetic number, because the mean of its divisors is an integer number (84891150).

Almost surely, 2^1221743682 is an apocalyptic number.

1221743682 is an abundant number, since it is smaller than the sum of its proper divisors (1494773118).

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

1221743682 is a wasteful number, since it uses less digits than its factorization.

1221743682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12767 (or 12761 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 1221743682 is about 34953.4502159658. The cubic root of 1221743682 is about 1069.0385523113.

The spelling of 1221743682 in words is "one billion, two hundred twenty-one million, seven hundred forty-three thousand, six hundred eighty-two".