138861603 has 24 divisors (see below), whose sum is σ = 210412800. Its totient is φ = 88078320.

The previous prime is 138861589. The next prime is 138861623. The reversal of 138861603 is 306168831.

138861603 is a `hidden beast` number, since 1 + 38 + 8 + 616 + 0 + 3 = 666.

It is not a de Polignac number, because 138861603 - 2⁸ = 138861347 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138861623) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39508 + ... + 42878.

It is an arithmetic number, because the mean of its divisors is an integer number (8767200).

Almost surely, 2^138861603 is an apocalyptic number.

138861603 is a deficient number, since it is larger than the sum of its proper divisors (71551197).

138861603 is a wasteful number, since it uses less digits than its factorization.

138861603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3599 (or 3596 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 138861603 is about 11783.9553206892. The cubic root of 138861603 is about 517.8381686642.

The spelling of 138861603 in words is "one hundred thirty-eight million, eight hundred sixty-one thousand, six hundred three".