1722489 has 4 divisors (see below), whose sum is σ = 2296656. Its totient is φ = 1148324.

The previous prime is 1722481. The next prime is 1722529. The reversal of 1722489 is 9842271.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9842271 = 3 ⋅3280757.

It is a cyclic number.

It is not a de Polignac number, because 1722489 - 2³ = 1722481 is a prime.

It is an Ulam number.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (1722481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 287079 + ... + 287084.

It is an arithmetic number, because the mean of its divisors is an integer number (574164).

2^1722489 is an apocalyptic number.

It is an amenable number.

1722489 is a deficient number, since it is larger than the sum of its proper divisors (574167).

1722489 is an equidigital number, since it uses as much as digits as its factorization.

1722489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574166.

The product of its digits is 8064, while the sum is 33.

The square root of 1722489 is about 1312.4362841677. The cubic root of 1722489 is about 119.8722946984.

It can be divided in two parts, 1722 and 489, that added together give a triangular number (2211 = T₆₆).

The spelling of 1722489 in words is "one million, seven hundred twenty-two thousand, four hundred eighty-nine".