1721723673 has 16 divisors (see below), whose sum is σ = 2396465280. Its totient is φ = 1097441664.

The previous prime is 1721723651. The next prime is 1721723681. The reversal of 1721723673 is 3763271271.

It is not a de Polignac number, because 1721723673 - 2¹² = 1721719577 is a prime.

It is a super-2 number, since 2×1721723673² = 5928664812337221858, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1721723623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 235765 + ... + 242957.

It is an arithmetic number, because the mean of its divisors is an integer number (149779080).

Almost surely, 2^1721723673 is an apocalyptic number.

It is an amenable number.

1721723673 is a deficient number, since it is larger than the sum of its proper divisors (674741607).

1721723673 is a wasteful number, since it uses less digits than its factorization.

1721723673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10688.

The product of its digits is 74088, while the sum is 39.

The square root of 1721723673 is about 41493.6582262880. The cubic root of 1721723673 is about 1198.5453839838.

The spelling of 1721723673 in words is "one billion, seven hundred twenty-one million, seven hundred twenty-three thousand, six hundred seventy-three".