1981185 has 16 divisors (see below), whose sum is σ = 3188160. Its totient is φ = 1050560.

The previous prime is 1981181. The next prime is 1981201. The reversal of 1981185 is 5811891.

It is not a de Polignac number, because 1981185 - 2² = 1981181 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1981181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3790 + ... + 4280.

It is an arithmetic number, because the mean of its divisors is an integer number (199260).

2^1981185 is an apocalyptic number.

1981185 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1981185 is a deficient number, since it is larger than the sum of its proper divisors (1206975).

1981185 is a wasteful number, since it uses less digits than its factorization.

1981185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768.

The product of its digits is 2880, while the sum is 33.

The square root of 1981185 is about 1407.5457363795. The cubic root of 1981185 is about 125.5957692937.

The spelling of 1981185 in words is "one million, nine hundred eighty-one thousand, one hundred eighty-five".