138565537 has 16 divisors (see below), whose sum is σ = 159678720. Its totient is φ = 118918800.

The previous prime is 138565529. The next prime is 138565543. The reversal of 138565537 is 735565831.

It is not a de Polignac number, because 138565537 - 2³ = 138565529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138565493 and 138565502.

It is not an unprimeable number, because it can be changed into a prime (138565507) 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 15 ways as a sum of consecutive naturals, for example, 68178 + ... + 70180.

It is an arithmetic number, because the mean of its divisors is an integer number (9979920).

Almost surely, 2^138565537 is an apocalyptic number.

It is an amenable number.

138565537 is a deficient number, since it is larger than the sum of its proper divisors (21113183).

138565537 is a wasteful number, since it uses less digits than its factorization.

138565537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2364.

The product of its digits is 378000, while the sum is 43.

The square root of 138565537 is about 11771.3863669493. The cubic root of 138565537 is about 517.4698802357.

The spelling of 138565537 in words is "one hundred thirty-eight million, five hundred sixty-five thousand, five hundred thirty-seven".