1721268 has 36 divisors (see below), whose sum is σ = 4395300. Its totient is φ = 567936.

The previous prime is 1721261. The next prime is 1721273. The reversal of 1721268 is 8621271.

It can be written as a sum of positive squares in 2 ways, for example, as 1140624 + 580644 = 1068^2 + 762^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1721261) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4758 + ... + 5106.

2^1721268 is an apocalyptic number.

1721268 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1721268 is an abundant number, since it is smaller than the sum of its proper divisors (2674032).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1721268 is a wasteful number, since it uses less digits than its factorization.

1721268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496 (or 491 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 1721268 is about 1311.9710362657. The cubic root of 1721268 is about 119.8439638606.

The spelling of 1721268 in words is "one million, seven hundred twenty-one thousand, two hundred sixty-eight".