1338188265 has 12 divisors (see below), whose sum is σ = 2319526404. Its totient is φ = 713700384.

The previous prime is 1338188261. The next prime is 1338188273. The reversal of 1338188265 is 5628818331.

1338188265 is a `hidden beast` number, since 1 + 3 + 381 + 8 + 8 + 265 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 809004249 + 529184016 = 28443^2 + 23004^2 .

It is not a de Polignac number, because 1338188265 - 2² = 1338188261 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 29737517 = 1338188265 / (1 + 3 + 3 + 8 + 1 + 8 + 8 + 2 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 1338188265.

It is not an unprimeable number, because it can be changed into a prime (1338188261) 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, 14868714 + ... + 14868803.

It is an arithmetic number, because the mean of its divisors is an integer number (193293867).

Almost surely, 2^1338188265 is an apocalyptic number.

1338188265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1338188265 is a deficient number, since it is larger than the sum of its proper divisors (981338139).

1338188265 is a wasteful number, since it uses less digits than its factorization.

1338188265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29737528 (or 29737525 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 1338188265 is about 36581.2556509478. The cubic root of 1338188265 is about 1101.9766840916.

The spelling of 1338188265 in words is "one billion, three hundred thirty-eight million, one hundred eighty-eight thousand, two hundred sixty-five".