1721052172 has 24 divisors (see below), whose sum is σ = 3553141760. Its totient is φ = 713800080.

The previous prime is 1721052169. The next prime is 1721052173. The reversal of 1721052172 is 2712501271.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 1721052172.

It is not an unprimeable number, because it can be changed into a prime (1721052173) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 990522 + ... + 992257.

Almost surely, 2^1721052172 is an apocalyptic number.

It is an amenable number.

1721052172 is an abundant number, since it is smaller than the sum of its proper divisors (1832089588).

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

1721052172 is a wasteful number, since it uses less digits than its factorization.

1721052172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1982821 (or 1982819 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 28.

The square root of 1721052172 is about 41485.5658271645. The cubic root of 1721052172 is about 1198.3895461470.

The spelling of 1721052172 in words is "one billion, seven hundred twenty-one million, fifty-two thousand, one hundred seventy-two".