1720042 has 8 divisors (see below), whose sum is σ = 2589156. Its totient is φ = 856992.

The previous prime is 1720039. The next prime is 1720049. The reversal of 1720042 is 2400271.

It can be written as a sum of positive squares in 2 ways, for example, as 1713481 + 6561 = 1309^2 + 81^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 1719998 and 1720025.

It is not an unprimeable number, because it can be changed into a prime (1720049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 723 + ... + 1990.

2^1720042 is an apocalyptic number.

1720042 is a deficient number, since it is larger than the sum of its proper divisors (869114).

1720042 is a wasteful number, since it uses less digits than its factorization.

1720042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3032.

The product of its (nonzero) digits is 112, while the sum is 16.

The square root of 1720042 is about 1311.5037171125. The cubic root of 1720042 is about 119.8155035245.

The spelling of 1720042 in words is "one million, seven hundred twenty thousand, forty-two".