1721064 has 16 divisors (see below), whose sum is σ = 4302720. Its totient is φ = 573680.

The previous prime is 1721023. The next prime is 1721081. The reversal of 1721064 is 4601271.

It is a super-2 number, since 2×1721064² = 5924122584192, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1721064.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35832 + ... + 35879.

It is an arithmetic number, because the mean of its divisors is an integer number (268920).

2^1721064 is an apocalyptic number.

It is an amenable number.

1721064 is an abundant number, since it is smaller than the sum of its proper divisors (2581656).

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

1721064 is a wasteful number, since it uses less digits than its factorization.

1721064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71720 (or 71716 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 1721064 is about 1311.8932883432. The cubic root of 1721064 is about 119.8392291467.

The spelling of 1721064 in words is "one million, seven hundred twenty-one thousand, sixty-four".