1720923 has 8 divisors (see below), whose sum is σ = 2303808. Its totient is φ = 1142664.

The previous prime is 1720909. The next prime is 1720931. The reversal of 1720923 is 3290271.

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

It is not a de Polignac number, because 1720923 - 2¹⁷ = 1589851 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1720893 and 1720902.

It is not an unprimeable number, because it can be changed into a prime (1720933) 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, 165 + ... + 1862.

It is an arithmetic number, because the mean of its divisors is an integer number (287976).

2^1720923 is an apocalyptic number.

1720923 is a deficient number, since it is larger than the sum of its proper divisors (582885).

1720923 is a wasteful number, since it uses less digits than its factorization.

1720923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2313.

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 1720923 is about 1311.8395481155. The cubic root of 1720923 is about 119.8359564052.

The spelling of 1720923 in words is "one million, seven hundred twenty thousand, nine hundred twenty-three".