1721972460 has 96 divisors (see below), whose sum is σ = 5221524672. Its totient is φ = 421493760.

The previous prime is 1721972459. The next prime is 1721972467. The reversal of 1721972460 is 642791271.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (1721972467) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 135082 + ... + 147278.

It is an arithmetic number, because the mean of its divisors is an integer number (54390882).

Almost surely, 2^1721972460 is an apocalyptic number.

1721972460 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1721972460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2610762336).

1721972460 is an abundant number, since it is smaller than the sum of its proper divisors (3499552212).

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

1721972460 is a wasteful number, since it uses less digits than its factorization.

1721972460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12403 (or 12401 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 1721972460 is about 41496.6560098522. The cubic root of 1721972460 is about 1198.6031106589.

The spelling of 1721972460 in words is "one billion, seven hundred twenty-one million, nine hundred seventy-two thousand, four hundred sixty".