138861544 has 8 divisors (see below), whose sum is σ = 260365410. Its totient is φ = 69430768.

The previous prime is 138861523. The next prime is 138861581. The reversal of 138861544 is 445168831.

138861544 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 97259044 + 41602500 = 9862^2 + 6450^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 138861497 and 138861506.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8678839 + ... + 8678854.

Almost surely, 2^138861544 is an apocalyptic number.

It is an amenable number.

138861544 is a deficient number, since it is larger than the sum of its proper divisors (121503866).

138861544 is a wasteful number, since it uses less digits than its factorization.

138861544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17357699 (or 17357695 counting only the distinct ones).

The product of its digits is 92160, while the sum is 40.

The square root of 138861544 is about 11783.9528172850. The cubic root of 138861544 is about 517.8380953239.

The spelling of 138861544 in words is "one hundred thirty-eight million, eight hundred sixty-one thousand, five hundred forty-four".