1720993 has 8 divisors (see below), whose sum is σ = 1774440. Its totient is φ = 1668480.

The previous prime is 1720991. The next prime is 1721003. The reversal of 1720993 is 3990271.

It can be written as a sum of positive squares in 4 ways, for example, as 200704 + 1520289 = 448^2 + 1233^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1720993 - 2¹ = 1720991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1720991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5271 + ... + 5587.

It is an arithmetic number, because the mean of its divisors is an integer number (221805).

2^1720993 is an apocalyptic number.

It is an amenable number.

1720993 is a deficient number, since it is larger than the sum of its proper divisors (53447).

1720993 is an equidigital number, since it uses as much as digits as its factorization.

1720993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 1720993 is about 1311.8662279364. The cubic root of 1720993 is about 119.8375811929.

The spelling of 1720993 in words is "one million, seven hundred twenty thousand, nine hundred ninety-three".