1721652172 has 12 divisors (see below), whose sum is σ = 3024896616. Its totient is φ = 857396000.

The previous prime is 1721652157. The next prime is 1721652181. The reversal of 1721652172 is 2712561271.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 856393 + ... + 858400.

It is an arithmetic number, because the mean of its divisors is an integer number (252074718).

Almost surely, 2^1721652172 is an apocalyptic number.

It is an amenable number.

1721652172 is a deficient number, since it is larger than the sum of its proper divisors (1303244444).

1721652172 is a wasteful number, since it uses less digits than its factorization.

1721652172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1715048 (or 1715046 counting only the distinct ones).

The product of its digits is 11760, while the sum is 34.

The square root of 1721652172 is about 41492.7966278485. The cubic root of 1721652172 is about 1198.5287923976.

Subtracting 1721652172 from its reverse (2712561271), we obtain a palindrome (990909099).

The spelling of 1721652172 in words is "one billion, seven hundred twenty-one million, six hundred fifty-two thousand, one hundred seventy-two".