1720534 has 4 divisors (see below), whose sum is σ = 2580804. Its totient is φ = 860266.

The previous prime is 1720517. The next prime is 1720549. The reversal of 1720534 is 4350271.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430132 + ... + 430135.

It is an arithmetic number, because the mean of its divisors is an integer number (645201).

2^1720534 is an apocalyptic number.

1720534 is a deficient number, since it is larger than the sum of its proper divisors (860270).

1720534 is an equidigital number, since it uses as much as digits as its factorization.

1720534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860269.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 1720534 is about 1311.6912746527. The cubic root of 1720534 is about 119.8269264254.

The spelling of 1720534 in words is "one million, seven hundred twenty thousand, five hundred thirty-four".