1221671938 has 8 divisors (see below), whose sum is σ = 1834989840. Its totient is φ = 610008660.

The previous prime is 1221671929. The next prime is 1221672047. The reversal of 1221671938 is 8391761221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1221671938.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 411808 + ... + 414763.

It is an arithmetic number, because the mean of its divisors is an integer number (229373730).

Almost surely, 2^1221671938 is an apocalyptic number.

1221671938 is a deficient number, since it is larger than the sum of its proper divisors (613317902).

1221671938 is an equidigital number, since it uses as much as digits as its factorization.

1221671938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 827312.

The product of its digits is 36288, while the sum is 40.

The square root of 1221671938 is about 34952.4239216682. The cubic root of 1221671938 is about 1069.0176263172.

The spelling of 1221671938 in words is "one billion, two hundred twenty-one million, six hundred seventy-one thousand, nine hundred thirty-eight".