1724509 has 2 divisors, whose sum is σ = 1724510. Its totient is φ = 1724508.

The previous prime is 1724507. The next prime is 1724537. The reversal of 1724509 is 9054271.

It is a happy number.

It is an a-pointer prime, because the next prime (1724537) can be obtained adding 1724509 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1452025 + 272484 = 1205^2 + 522^2 .

It is a cyclic number.

It is not a de Polignac number, because 1724509 - 2¹ = 1724507 is a prime.

Together with 1724507, it forms a pair of twin primes.

It is equal to p₁₂₉₈₂₆ and since 1724509 and 129826 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1724507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 862254 + 862255.

It is an arithmetic number, because the mean of its divisors is an integer number (862255).

2^1724509 is an apocalyptic number.

It is an amenable number.

1724509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1724509 is an equidigital number, since it uses as much as digits as its factorization.

1724509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 1724509 is about 1313.2056198479. The cubic root of 1724509 is about 119.9191353346.

The spelling of 1724509 in words is "one million, seven hundred twenty-four thousand, five hundred nine".