138861607 has 4 divisors (see below), whose sum is σ = 139000240. Its totient is φ = 138722976.

The previous prime is 138861589. The next prime is 138861623. The reversal of 138861607 is 706168831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138861607 - 2⁷ = 138861479 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 138861607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138861647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67803 + ... + 69820.

It is an arithmetic number, because the mean of its divisors is an integer number (34750060).

Almost surely, 2^138861607 is an apocalyptic number.

138861607 is a deficient number, since it is larger than the sum of its proper divisors (138633).

138861607 is a wasteful number, since it uses less digits than its factorization.

138861607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138632.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 138861607 is about 11783.9554904115. The cubic root of 138861607 is about 517.8381736364.

The spelling of 138861607 in words is "one hundred thirty-eight million, eight hundred sixty-one thousand, six hundred seven".