1945385 has 12 divisors (see below), whose sum is σ = 2528652. Its totient is φ = 1428288.

The previous prime is 1945381. The next prime is 1945393. The reversal of 1945385 is 5835491.

It can be written as a sum of positive squares in 6 ways, for example, as 87616 + 1857769 = 296^2 + 1363^2 .

It is not a de Polignac number, because 1945385 - 2² = 1945381 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1945381) 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 11 ways as a sum of consecutive naturals, for example, 11159 + ... + 11331.

It is an arithmetic number, because the mean of its divisors is an integer number (210721).

2^1945385 is an apocalyptic number.

It is an amenable number.

1945385 is a deficient number, since it is larger than the sum of its proper divisors (583267).

1945385 is an equidigital number, since it uses as much as digits as its factorization.

1945385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364 (or 191 counting only the distinct ones).

The product of its digits is 21600, while the sum is 35.

The square root of 1945385 is about 1394.7705904556. The cubic root of 1945385 is about 124.8346614016.

The spelling of 1945385 in words is "one million, nine hundred forty-five thousand, three hundred eighty-five".