1721149276 has 96 divisors (see below), whose sum is σ = 4060224000. Its totient is φ = 618036480.

The previous prime is 1721149273. The next prime is 1721149277. The reversal of 1721149276 is 6729411271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1721149273) 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, 212550 + ... + 220498.

It is an arithmetic number, because the mean of its divisors is an integer number (42294000).

Almost surely, 2^1721149276 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1721149276, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2030112000).

1721149276 is an abundant number, since it is smaller than the sum of its proper divisors (2339074724).

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

1721149276 is a wasteful number, since it uses less digits than its factorization.

1721149276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8027 (or 8025 counting only the distinct ones).

The product of its digits is 42336, while the sum is 40.

The square root of 1721149276 is about 41486.7361454236. The cubic root of 1721149276 is about 1198.4120839549.

The spelling of 1721149276 in words is "one billion, seven hundred twenty-one million, one hundred forty-nine thousand, two hundred seventy-six".