1720149 has 4 divisors (see below), whose sum is σ = 2293536. Its totient is φ = 1146764.

The previous prime is 1720133. The next prime is 1720151. The reversal of 1720149 is 9410271.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1720149 - 2⁴ = 1720133 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720109) 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, 286689 + ... + 286694.

It is an arithmetic number, because the mean of its divisors is an integer number (573384).

2^1720149 is an apocalyptic number.

It is an amenable number.

1720149 is a deficient number, since it is larger than the sum of its proper divisors (573387).

1720149 is an equidigital number, since it uses as much as digits as its factorization.

1720149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573386.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 1720149 is about 1311.5445093477. The cubic root of 1720149 is about 119.8179879586.

The spelling of 1720149 in words is "one million, seven hundred twenty thousand, one hundred forty-nine".