1385813 has 12 divisors (see below), whose sum is σ = 1642284. Its totient is φ = 1161600.

The previous prime is 1385809. The next prime is 1385827. The reversal of 1385813 is 3185831.

It can be written as a sum of positive squares in 2 ways, for example, as 223729 + 1162084 = 473^2 + 1078^2 .

It is not a de Polignac number, because 1385813 - 2² = 1385809 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 (1385833) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1133 + ... + 2013.

It is an arithmetic number, because the mean of its divisors is an integer number (136857).

2^1385813 is an apocalyptic number.

1385813 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1385813 is a deficient number, since it is larger than the sum of its proper divisors (256471).

1385813 is a wasteful number, since it uses less digits than its factorization.

1385813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 916 (or 905 counting only the distinct ones).

The product of its digits is 2880, while the sum is 29.

The square root of 1385813 is about 1177.2055895212. The cubic root of 1385813 is about 111.4897334149.

The spelling of 1385813 in words is "one million, three hundred eighty-five thousand, eight hundred thirteen".