1722719 has 2 divisors, whose sum is σ = 1722720. Its totient is φ = 1722718.

The previous prime is 1722713. The next prime is 1722731. The reversal of 1722719 is 9172271.

It is a weak prime.

It is an emirp because it is prime and its reverse (9172271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1722719 - 2⁸ = 1722463 is a prime.

It is a super-2 number, since 2×1722719² = 5935521505922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1722691 and 1722700.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1722713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 861359 + 861360.

It is an arithmetic number, because the mean of its divisors is an integer number (861360).

2^1722719 is an apocalyptic number.

1722719 is a deficient number, since it is larger than the sum of its proper divisors (1).

1722719 is an equidigital number, since it uses as much as digits as its factorization.

1722719 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1764, while the sum is 29.

The square root of 1722719 is about 1312.5239045442. The cubic root of 1722719 is about 119.8776298850.

The spelling of 1722719 in words is "one million, seven hundred twenty-two thousand, seven hundred nineteen".