1721488 has 20 divisors (see below), whose sum is σ = 3532140. Its totient is φ = 809984.

The previous prime is 1721477. The next prime is 1721497. The reversal of 1721488 is 8841271.

It can be written as a sum of positive squares in 2 ways, for example, as 1327104 + 394384 = 1152^2 + 628^2 .

It is a nialpdrome in base 8.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2893 + ... + 3436.

It is an arithmetic number, because the mean of its divisors is an integer number (176607).

2^1721488 is an apocalyptic number.

It is an amenable number.

1721488 is an abundant number, since it is smaller than the sum of its proper divisors (1810652).

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

1721488 is a wasteful number, since it uses less digits than its factorization.

1721488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6354 (or 6348 counting only the distinct ones).

The product of its digits is 3584, while the sum is 31.

The square root of 1721488 is about 1312.0548769011. The cubic root of 1721488 is about 119.8490695054.

It can be divided in two parts, 1721 and 488, that added together give a square (2209 = 47²).

The spelling of 1721488 in words is "one million, seven hundred twenty-one thousand, four hundred eighty-eight".