1380518185 has 4 divisors (see below), whose sum is σ = 1656621828. Its totient is φ = 1104414544.

The previous prime is 1380518179. The next prime is 1380518219. The reversal of 1380518185 is 5818150831.

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 157477401 + 1223040784 = 12549^2 + 34972^2 .

It is a cyclic number.

It is not a de Polignac number, because 1380518185 - 2³ = 1380518177 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

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, 138051814 + ... + 138051823.

It is an arithmetic number, because the mean of its divisors is an integer number (414155457).

Almost surely, 2^1380518185 is an apocalyptic number.

It is an amenable number.

1380518185 is a deficient number, since it is larger than the sum of its proper divisors (276103643).

1380518185 is an equidigital number, since it uses as much as digits as its factorization.

1380518185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276103642.

The product of its (nonzero) digits is 38400, while the sum is 40.

The square root of 1380518185 is about 37155.3251230560. The cubic root of 1380518185 is about 1113.4756153293.

The spelling of 1380518185 in words is "one billion, three hundred eighty million, five hundred eighteen thousand, one hundred eighty-five".