1721472 has 32 divisors (see below), whose sum is σ = 4573680. Its totient is φ = 573696.

The previous prime is 1721453. The next prime is 1721477. The reversal of 1721472 is 2741271.

It is a tau number, because it is divible by the number of its divisors (32).

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (1721477) 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, 1858 + ... + 2625.

2^1721472 is an apocalyptic number.

1721472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1721472 is an abundant number, since it is smaller than the sum of its proper divisors (2852208).

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

1721472 is an equidigital number, since it uses as much as digits as its factorization.

1721472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4500 (or 4488 counting only the distinct ones).

The product of its digits is 784, while the sum is 24.

The square root of 1721472 is about 1312.0487795810. The cubic root of 1721472 is about 119.8486982004.

The spelling of 1721472 in words is "one million, seven hundred twenty-one thousand, four hundred seventy-two".