1722039 has 8 divisors (see below), whose sum is σ = 2504832. Its totient is φ = 1043640.

The previous prime is 1722037. The next prime is 1722053. The reversal of 1722039 is 9302271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1722039 - 2¹ = 1722037 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1722031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26059 + ... + 26124.

It is an arithmetic number, because the mean of its divisors is an integer number (313104).

2^1722039 is an apocalyptic number.

1722039 is a deficient number, since it is larger than the sum of its proper divisors (782793).

1722039 is a wasteful number, since it uses less digits than its factorization.

1722039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52197.

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 1722039 is about 1312.2648360754. The cubic root of 1722039 is about 119.8618549160.

It can be divided in two parts, 172 and 2039, that added together give a triangular number (2211 = T₆₆).

The spelling of 1722039 in words is "one million, seven hundred twenty-two thousand, thirty-nine".