1878845 has 6 divisors (see below), whose sum is σ = 2258298. Its totient is φ = 1500624.

The previous prime is 1878841. The next prime is 1878869. The reversal of 1878845 is 5488781.

It can be written as a sum of positive squares in 3 ways, for example, as 293764 + 1585081 = 542^2 + 1259^2 .

It is not a de Polignac number, because 1878845 - 2² = 1878841 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1878841) 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 5 ways as a sum of consecutive naturals, for example, 2759 + ... + 3371.

It is an arithmetic number, because the mean of its divisors is an integer number (376383).

2^1878845 is an apocalyptic number.

It is an amenable number.

1878845 is a deficient number, since it is larger than the sum of its proper divisors (379453).

1878845 is an frugal number, since it uses more digits than its factorization.

1878845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1231 (or 618 counting only the distinct ones).

The product of its digits is 71680, while the sum is 41.

The square root of 1878845 is about 1370.7096702074. The cubic root of 1878845 is about 123.3948358136.

The spelling of 1878845 in words is "one million, eight hundred seventy-eight thousand, eight hundred forty-five".