138527865 has 24 divisors (see below), whose sum is σ = 274417728. Its totient is φ = 63326880.

The previous prime is 138527861. The next prime is 138527869. The reversal of 138527865 is 568725831.

It is an interprime number because it is at equal distance from previous prime (138527861) and next prime (138527869).

It is not a de Polignac number, because 138527865 - 2² = 138527861 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 138527865.

It is not an unprimeable number, because it can be changed into a prime (138527861) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 219571 + ... + 220200.

It is an arithmetic number, because the mean of its divisors is an integer number (11434072).

Almost surely, 2^138527865 is an apocalyptic number.

138527865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138527865 is a deficient number, since it is larger than the sum of its proper divisors (135889863).

138527865 is a wasteful number, since it uses less digits than its factorization.

138527865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439789 (or 439786 counting only the distinct ones).

The product of its digits is 403200, while the sum is 45.

The square root of 138527865 is about 11769.7861068075. The cubic root of 138527865 is about 517.4229809064.

The spelling of 138527865 in words is "one hundred thirty-eight million, five hundred twenty-seven thousand, eight hundred sixty-five".