1721012 has 12 divisors (see below), whose sum is σ = 3189060. Its totient is φ = 809856.

The previous prime is 1721011. The next prime is 1721023. The reversal of 1721012 is 2101271.

It can be written as a sum of positive squares in 2 ways, for example, as 1196836 + 524176 = 1094^2 + 724^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1721011) 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, 12587 + ... + 12722.

It is an arithmetic number, because the mean of its divisors is an integer number (265755).

2^1721012 is an apocalyptic number.

It is an amenable number.

1721012 is a deficient number, since it is larger than the sum of its proper divisors (1468048).

1721012 is a wasteful number, since it uses less digits than its factorization.

1721012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25330 (or 25328 counting only the distinct ones).

The product of its (nonzero) digits is 28, while the sum is 14.

The square root of 1721012 is about 1311.8734695084. The cubic root of 1721012 is about 119.8380221990.

Adding to 1721012 its reverse (2101271), we get a palindrome (3822283).

The spelling of 1721012 in words is "one million, seven hundred twenty-one thousand, twelve".