1720849 has 8 divisors (see below), whose sum is σ = 1951040. Its totient is φ = 1504656.

The previous prime is 1720847. The next prime is 1720867. The reversal of 1720849 is 9480271.

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

It is a cyclic number.

It is not a de Polignac number, because 1720849 - 2¹ = 1720847 is a prime.

It is a super-2 number, since 2×1720849² = 5922642561602, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1720849.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3237 + ... + 3730.

It is an arithmetic number, because the mean of its divisors is an integer number (243880).

2^1720849 is an apocalyptic number.

1720849 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1720849 is a deficient number, since it is larger than the sum of its proper divisors (230191).

1720849 is a wasteful number, since it uses less digits than its factorization.

1720849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6999.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 1720849 is about 1311.8113431435. The cubic root of 1720849 is about 119.8342387247.

The spelling of 1720849 in words is "one million, seven hundred twenty thousand, eight hundred forty-nine".