1238739165 has 12 divisors (see below), whose sum is σ = 2147147964. Its totient is φ = 660660864.

The previous prime is 1238739163. The next prime is 1238739209. The reversal of 1238739165 is 5619378321.

1238739165 is a `hidden beast` number, since 123 + 87 + 391 + 65 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 557998884 + 680740281 = 23622^2 + 26091^2 .

It is not a de Polignac number, because 1238739165 - 2¹ = 1238739163 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: 27527537 = 1238739165 / (1 + 2 + 3 + 8 + 7 + 3 + 9 + 1 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 1238739165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1238739163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13763724 + ... + 13763813.

It is an arithmetic number, because the mean of its divisors is an integer number (178928997).

Almost surely, 2^1238739165 is an apocalyptic number.

1238739165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1238739165 is a deficient number, since it is larger than the sum of its proper divisors (908408799).

1238739165 is a wasteful number, since it uses less digits than its factorization.

1238739165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27527548 (or 27527545 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 1238739165 is about 35195.7265161553. The cubic root of 1238739165 is about 1073.9728179923.

The spelling of 1238739165 in words is "one billion, two hundred thirty-eight million, seven hundred thirty-nine thousand, one hundred sixty-five".