1721253 has 8 divisors (see below), whose sum is σ = 2327616. Its totient is φ = 1131200.

The previous prime is 1721243. The next prime is 1721257. The reversal of 1721253 is 3521271.

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

It is a cyclic number.

It is not a de Polignac number, because 1721253 - 2¹⁸ = 1459109 is a prime.

1721253 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1721257) 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, 3828 + ... + 4253.

It is an arithmetic number, because the mean of its divisors is an integer number (290952).

2^1721253 is an apocalyptic number.

It is an amenable number.

1721253 is a deficient number, since it is larger than the sum of its proper divisors (606363).

1721253 is an equidigital number, since it uses as much as digits as its factorization.

1721253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8155.

The product of its digits is 420, while the sum is 21.

The square root of 1721253 is about 1311.9653196636. The cubic root of 1721253 is about 119.8436157326.

The spelling of 1721253 in words is "one million, seven hundred twenty-one thousand, two hundred fifty-three".