1720315 has 16 divisors (see below), whose sum is σ = 2248992. Its totient is φ = 1257984.

The previous prime is 1720307. The next prime is 1720321. The reversal of 1720315 is 5130271.

It is a cyclic number.

It is not a de Polignac number, because 1720315 - 2³ = 1720307 is a prime.

It is a Duffinian number.

1720315 is a lucky number.

It is a nialpdrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 1720292 and 1720301.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2872 + ... + 3418.

It is an arithmetic number, because the mean of its divisors is an integer number (140562).

2^1720315 is an apocalyptic number.

1720315 is a deficient number, since it is larger than the sum of its proper divisors (528677).

1720315 is a wasteful number, since it uses less digits than its factorization.

1720315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606.

The product of its (nonzero) digits is 210, while the sum is 19.

The square root of 1720315 is about 1311.6077919866. The cubic root of 1720315 is about 119.8218421104.

Adding to 1720315 its reverse (5130271), we get a palindrome (6850586).

The spelling of 1720315 in words is "one million, seven hundred twenty thousand, three hundred fifteen".