138873445 has 16 divisors (see below), whose sum is σ = 172307520. Its totient is φ = 107380224.

The previous prime is 138873443. The next prime is 138873457. The reversal of 138873445 is 544378831.

It is a cyclic number.

It is not a de Polignac number, because 138873445 - 2¹ = 138873443 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138873443) 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 15 ways as a sum of consecutive naturals, for example, 17526 + ... + 24184.

It is an arithmetic number, because the mean of its divisors is an integer number (10769220).

Almost surely, 2^138873445 is an apocalyptic number.

It is an amenable number.

138873445 is a deficient number, since it is larger than the sum of its proper divisors (33434075).

138873445 is an equidigital number, since it uses as much as digits as its factorization.

138873445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6804.

The product of its digits is 322560, while the sum is 43.

The square root of 138873445 is about 11784.4577728464. The cubic root of 138873445 is about 517.8528885127.

The spelling of 138873445 in words is "one hundred thirty-eight million, eight hundred seventy-three thousand, four hundred forty-five".