1391185 has 4 divisors (see below), whose sum is σ = 1669428. Its totient is φ = 1112944.

The previous prime is 1391183. The next prime is 1391189. The reversal of 1391185 is 5811931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 744769 + 646416 = 863^2 + 804^2 .

It is a cyclic number.

It is not a de Polignac number, because 1391185 - 2¹ = 1391183 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1391183) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139114 + ... + 139123.

It is an arithmetic number, because the mean of its divisors is an integer number (417357).

2^1391185 is an apocalyptic number.

It is an amenable number.

1391185 is a deficient number, since it is larger than the sum of its proper divisors (278243).

1391185 is an equidigital number, since it uses as much as digits as its factorization.

1391185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278242.

The product of its digits is 1080, while the sum is 28.

The square root of 1391185 is about 1179.4850571330. The cubic root of 1391185 is about 111.6336081939.

The spelling of 1391185 in words is "one million, three hundred ninety-one thousand, one hundred eighty-five".