1720947 has 16 divisors (see below), whose sum is σ = 2407680. Its totient is φ = 1092000.

The previous prime is 1720937. The next prime is 1720949. The reversal of 1720947 is 7490271.

It is not a de Polignac number, because 1720947 - 2⁴ = 1720931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1720949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11322 + ... + 11472.

It is an arithmetic number, because the mean of its divisors is an integer number (150480).

2^1720947 is an apocalyptic number.

1720947 is a deficient number, since it is larger than the sum of its proper divisors (686733).

1720947 is a wasteful number, since it uses less digits than its factorization.

1720947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314.

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 1720947 is about 1311.8486955438. The cubic root of 1720947 is about 119.8365134802.

The spelling of 1720947 in words is "one million, seven hundred twenty thousand, nine hundred forty-seven".