1721459 has 4 divisors (see below), whose sum is σ = 1739304. Its totient is φ = 1703616.

The previous prime is 1721453. The next prime is 1721477. The reversal of 1721459 is 9541271.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1721459 - 2¹² = 1717363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1721453) 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, 8777 + ... + 8970.

It is an arithmetic number, because the mean of its divisors is an integer number (434826).

2^1721459 is an apocalyptic number.

1721459 is a deficient number, since it is larger than the sum of its proper divisors (17845).

1721459 is an equidigital number, since it uses as much as digits as its factorization.

1721459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17844.

The product of its digits is 2520, while the sum is 29.

The square root of 1721459 is about 1312.0438254875. The cubic root of 1721459 is about 119.8483965135.

The spelling of 1721459 in words is "one million, seven hundred twenty-one thousand, four hundred fifty-nine".