1720933 has 2 divisors, whose sum is σ = 1720934. Its totient is φ = 1720932.

The previous prime is 1720931. The next prime is 1720937. The reversal of 1720933 is 3390271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 887364 + 833569 = 942^2 + 913^2 .

It is an emirp because it is prime and its reverse (3390271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1720933 - 2¹ = 1720931 is a prime.

It is a super-2 number, since 2×1720933² = 5923220780978, which contains 22 as substring.

Together with 1720931, it forms a pair of twin primes.

It is an Ulam number.

1720933 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1720898 and 1720907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1720931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860466 + 860467.

It is an arithmetic number, because the mean of its divisors is an integer number (860467).

2^1720933 is an apocalyptic number.

It is an amenable number.

1720933 is a deficient number, since it is larger than the sum of its proper divisors (1).

1720933 is an equidigital number, since it uses as much as digits as its factorization.

1720933 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1134, while the sum is 25.

The square root of 1720933 is about 1311.8433595517. The cubic root of 1720933 is about 119.8361885205.

The spelling of 1720933 in words is "one million, seven hundred twenty thousand, nine hundred thirty-three".