1722845 has 6 divisors (see below), whose sum is σ = 2070942. Its totient is φ = 1375928.

The previous prime is 1722839. The next prime is 1722857. The reversal of 1722845 is 5482271.

It can be written as a sum of positive squares in only one way, i.e., 1378276 + 344569 = 1174^2 + 587^2 .

It is not a de Polignac number, because 1722845 - 2⁴ = 1722829 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 11.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2642 + ... + 3228.

It is an arithmetic number, because the mean of its divisors is an integer number (345157).

2^1722845 is an apocalyptic number.

It is an amenable number.

1722845 is a deficient number, since it is larger than the sum of its proper divisors (348097).

1722845 is an frugal number, since it uses more digits than its factorization.

1722845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1179 (or 592 counting only the distinct ones).

The product of its digits is 4480, while the sum is 29.

The square root of 1722845 is about 1312.5719027924. The cubic root of 1722845 is about 119.8805524381.

The spelling of 1722845 in words is "one million, seven hundred twenty-two thousand, eight hundred forty-five".