1722700721 has 32 divisors (see below), whose sum is σ = 2147819520. Its totient is φ = 1348358400.

The previous prime is 1722700699. The next prime is 1722700741. The reversal of 1722700721 is 1270072271.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1722700721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1722700741) 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, 1265081 + ... + 1266441.

It is an arithmetic number, because the mean of its divisors is an integer number (67119360).

Almost surely, 2^1722700721 is an apocalyptic number.

It is an amenable number.

1722700721 is a deficient number, since it is larger than the sum of its proper divisors (425118799).

1722700721 is a wasteful number, since it uses less digits than its factorization.

1722700721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1725.

The product of its (nonzero) digits is 2744, while the sum is 29.

The square root of 1722700721 is about 41505.4300182518. The cubic root of 1722700721 is about 1198.7720589422.

Adding to 1722700721 its reverse (1270072271), we get a palindrome (2992772992).

The spelling of 1722700721 in words is "one billion, seven hundred twenty-two million, seven hundred thousand, seven hundred twenty-one".