1720424 has 16 divisors (see below), whose sum is σ = 3265920. Its totient is φ = 849520.

The previous prime is 1720421. The next prime is 1720427. The reversal of 1720424 is 4240271.

It is an interprime number because it is at equal distance from previous prime (1720421) and next prime (1720427).

It is a junction number, because it is equal to n+sod(n) for n = 1720396 and 1720405.

It is not an unprimeable number, because it can be changed into a prime (1720421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 632 + ... + 1959.

It is an arithmetic number, because the mean of its divisors is an integer number (204120).

2^1720424 is an apocalyptic number.

It is an amenable number.

1720424 is a deficient number, since it is larger than the sum of its proper divisors (1545496).

1720424 is a wasteful number, since it uses less digits than its factorization.

1720424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2680 (or 2676 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 1720424 is about 1311.6493433841. The cubic root of 1720424 is about 119.8243727138.

Adding to 1720424 its reverse (4240271), we get a palindrome (5960695).

The spelling of 1720424 in words is "one million, seven hundred twenty thousand, four hundred twenty-four".