138861573 has 12 divisors (see below), whose sum is σ = 187434240. Its totient is φ = 91445416.

The previous prime is 138861523. The next prime is 138861581. The reversal of 138861573 is 375168831.

It is not a de Polignac number, because 138861573 - 2⁶ = 138861509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138861523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17308 + ... + 24026.

It is an arithmetic number, because the mean of its divisors is an integer number (15619520).

Almost surely, 2^138861573 is an apocalyptic number.

It is an amenable number.

138861573 is a deficient number, since it is larger than the sum of its proper divisors (48572667).

138861573 is an frugal number, since it uses more digits than its factorization.

138861573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6888 (or 6805 counting only the distinct ones).

The product of its digits is 120960, while the sum is 42.

The square root of 138861573 is about 11783.9540477719. The cubic root of 138861573 is about 517.8381313725.

The spelling of 138861573 in words is "one hundred thirty-eight million, eight hundred sixty-one thousand, five hundred seventy-three".