1721672 has 32 divisors (see below), whose sum is σ = 3439800. Its totient is φ = 806400.

The previous prime is 1721659. The next prime is 1721683. The reversal of 1721672 is 2761271.

It can be written as a sum of positive squares in 4 ways, for example, as 498436 + 1223236 = 706^2 + 1106^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9422 + ... + 9602.

2^1721672 is an apocalyptic number.

It is an amenable number.

1721672 is a deficient number, since it is larger than the sum of its proper divisors (1718128).

1721672 is a wasteful number, since it uses less digits than its factorization.

1721672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257 (or 253 counting only the distinct ones).

The product of its digits is 1176, while the sum is 26.

The square root of 1721672 is about 1312.1249940459. The cubic root of 1721672 is about 119.8533393470.

The spelling of 1721672 in words is "one million, seven hundred twenty-one thousand, six hundred seventy-two".