1721479 has 4 divisors (see below), whose sum is σ = 1724976. Its totient is φ = 1717984.

The previous prime is 1721477. The next prime is 1721497. The reversal of 1721479 is 9741271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9741271 = 71 ⋅137201.

It is a cyclic number.

It is not a de Polignac number, because 1721479 - 2¹ = 1721477 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

1721479 is a lucky number.

It is a nialpdrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 1721479.

It is a congruent number.

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, 859 + ... + 2044.

It is an arithmetic number, because the mean of its divisors is an integer number (431244).

2^1721479 is an apocalyptic number.

1721479 is a deficient number, since it is larger than the sum of its proper divisors (3497).

1721479 is an equidigital number, since it uses as much as digits as its factorization.

1721479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3496.

The product of its digits is 3528, while the sum is 31.

The square root of 1721479 is about 1312.0514471620. The cubic root of 1721479 is about 119.8488606466.

The spelling of 1721479 in words is "one million, seven hundred twenty-one thousand, four hundred seventy-nine".