1721056 has 12 divisors (see below), whose sum is σ = 3388392. Its totient is φ = 860512.

The previous prime is 1721023. The next prime is 1721081. The reversal of 1721056 is 6501271.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26860 + ... + 26923.

It is an arithmetic number, because the mean of its divisors is an integer number (282366).

2^1721056 is an apocalyptic number.

1721056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1721056 is a deficient number, since it is larger than the sum of its proper divisors (1667336).

1721056 is an equidigital number, since it uses as much as digits as its factorization.

1721056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53793 (or 53785 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 1721056 is about 1311.8902393112. The cubic root of 1721056 is about 119.8390434641.

The spelling of 1721056 in words is "one million, seven hundred twenty-one thousand, fifty-six".