1385591 has 4 divisors (see below), whose sum is σ = 1433400. Its totient is φ = 1337784.

The previous prime is 1385569. The next prime is 1385603. The reversal of 1385591 is 1955831.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1385591 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 (1385521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23861 + ... + 23918.

It is an arithmetic number, because the mean of its divisors is an integer number (358350).

2^1385591 is an apocalyptic number.

1385591 is a deficient number, since it is larger than the sum of its proper divisors (47809).

1385591 is an equidigital number, since it uses as much as digits as its factorization.

1385591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47808.

The product of its digits is 5400, while the sum is 32.

The square root of 1385591 is about 1177.1112946531. Note that the first 3 decimals coincide. The cubic root of 1385591 is about 111.4837797395.

The spelling of 1385591 in words is "one million, three hundred eighty-five thousand, five hundred ninety-one".