1722739 has 2 divisors, whose sum is σ = 1722740. Its totient is φ = 1722738.

The previous prime is 1722737. The next prime is 1722751. The reversal of 1722739 is 9372271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1722739 - 2¹ = 1722737 is a prime.

Together with 1722737, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1722739.

It is not a weakly prime, because it can be changed into another prime (1722731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 861369 + 861370.

It is an arithmetic number, because the mean of its divisors is an integer number (861370).

2^1722739 is an apocalyptic number.

1722739 is a deficient number, since it is larger than the sum of its proper divisors (1).

1722739 is an equidigital number, since it uses as much as digits as its factorization.

1722739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5292, while the sum is 31.

The square root of 1722739 is about 1312.5315234310. The cubic root of 1722739 is about 119.8780937918.

The spelling of 1722739 in words is "one million, seven hundred twenty-two thousand, seven hundred thirty-nine".