1385181373 has 4 divisors (see below), whose sum is σ = 1385294140. Its totient is φ = 1385068608.

The previous prime is 1385181359. The next prime is 1385181407. The reversal of 1385181373 is 3731815831.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 33663204 + 1351518169 = 5802^2 + 36763^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1385181373 is a prime.

It is a super-2 number, since 2×1385181373² = 3837454872212330258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1385181353) 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 3 ways as a sum of consecutive naturals, for example, 35340 + ... + 63397.

It is an arithmetic number, because the mean of its divisors is an integer number (346323535).

Almost surely, 2^1385181373 is an apocalyptic number.

It is an amenable number.

1385181373 is a deficient number, since it is larger than the sum of its proper divisors (112767).

1385181373 is an equidigital number, since it uses as much as digits as its factorization.

1385181373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112766.

The product of its digits is 60480, while the sum is 40.

The square root of 1385181373 is about 37218.0248401228. The cubic root of 1385181373 is about 1114.7279254648.

The spelling of 1385181373 in words is "one billion, three hundred eighty-five million, one hundred eighty-one thousand, three hundred seventy-three".