138625537 has 4 divisors (see below), whose sum is σ = 139971520. Its totient is φ = 137279556.

The previous prime is 138625519. The next prime is 138625541. The reversal of 138625537 is 735526831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 138625537 - 2¹¹ = 138623489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138625537.

It is not an unprimeable number, because it can be changed into a prime (138625237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 672837 + ... + 673042.

It is an arithmetic number, because the mean of its divisors is an integer number (34992880).

Almost surely, 2^138625537 is an apocalyptic number.

It is an amenable number.

138625537 is a deficient number, since it is larger than the sum of its proper divisors (1345983).

138625537 is a wasteful number, since it uses less digits than its factorization.

138625537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1345982.

The product of its digits is 151200, while the sum is 40.

The square root of 138625537 is about 11773.9346439497. The cubic root of 138625537 is about 517.5445590079.

The spelling of 138625537 in words is "one hundred thirty-eight million, six hundred twenty-five thousand, five hundred thirty-seven".