19917122 has 8 divisors (see below), whose sum is σ = 29909196. Its totient is φ = 9947392.

The previous prime is 19917067. The next prime is 19917167. The reversal of 19917122 is 22171991.

It can be written as a sum of positive squares in 2 ways, for example, as 17230801 + 2686321 = 4151^2 + 1639^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3143 + ... + 7050.

Almost surely, 2^19917122 is an apocalyptic number.

19917122 is a deficient number, since it is larger than the sum of its proper divisors (9992074).

19917122 is a wasteful number, since it uses less digits than its factorization.

19917122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11172.

The product of its digits is 2268, while the sum is 32.

The square root of 19917122 is about 4462.8602935785. The cubic root of 19917122 is about 271.0663000504.

The spelling of 19917122 in words is "nineteen million, nine hundred seventeen thousand, one hundred twenty-two".