1721990118 has 32 divisors (see below), whose sum is σ = 3460896000. Its totient is φ = 571186080.

The previous prime is 1721990099. The next prime is 1721990147. The reversal of 1721990118 is 8110991271.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1457488 + ... + 1458668.

It is an arithmetic number, because the mean of its divisors is an integer number (108153000).

Almost surely, 2^1721990118 is an apocalyptic number.

1721990118 is an abundant number, since it is smaller than the sum of its proper divisors (1738905882).

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

1721990118 is a wasteful number, since it uses less digits than its factorization.

1721990118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2172.

The product of its (nonzero) digits is 9072, while the sum is 39.

The square root of 1721990118 is about 41496.8687734388. The cubic root of 1721990118 is about 1198.6072076778.

The spelling of 1721990118 in words is "one billion, seven hundred twenty-one million, nine hundred ninety thousand, one hundred eighteen".