138145637 has 8 divisors (see below), whose sum is σ = 166190400. Its totient is φ = 112178304.

The previous prime is 138145633. The next prime is 138145639. The reversal of 138145637 is 736541831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 138145637 - 2² = 138145633 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 138145637.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138145633) 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 7 ways as a sum of consecutive naturals, for example, 519212 + ... + 519477.

It is an arithmetic number, because the mean of its divisors is an integer number (20773800).

Almost surely, 2^138145637 is an apocalyptic number.

It is an amenable number.

138145637 is a deficient number, since it is larger than the sum of its proper divisors (28044763).

138145637 is a wasteful number, since it uses less digits than its factorization.

138145637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1038715.

The product of its digits is 60480, while the sum is 38.

The square root of 138145637 is about 11753.5372122608. The cubic root of 138145637 is about 516.9466489898.

The spelling of 138145637 in words is "one hundred thirty-eight million, one hundred forty-five thousand, six hundred thirty-seven".