1720442 has 8 divisors (see below), whose sum is σ = 2643732. Its totient is φ = 839200.

The previous prime is 1720429. The next prime is 1720457. The reversal of 1720442 is 2440271.

It can be written as a sum of positive squares in 2 ways, for example, as 1590121 + 130321 = 1261^2 + 361^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10409 + ... + 10572.

2^1720442 is an apocalyptic number.

1720442 is a deficient number, since it is larger than the sum of its proper divisors (923290).

1720442 is a wasteful number, since it uses less digits than its factorization.

1720442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21024.

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

The square root of 1720442 is about 1311.6562049562. The cubic root of 1720442 is about 119.8247906014.

The spelling of 1720442 in words is "one million, seven hundred twenty thousand, four hundred forty-two".