138887845 has 4 divisors (see below), whose sum is σ = 166665420. Its totient is φ = 111110272.

The previous prime is 138887839. The next prime is 138887849. The reversal of 138887845 is 548788831.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 104980516 + 33907329 = 10246^2 + 5823^2 .

It is a cyclic number.

It is not a de Polignac number, because 138887845 - 2¹⁷ = 138756773 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138887792 and 138887801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138887849) 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 3 ways as a sum of consecutive naturals, for example, 13888780 + ... + 13888789.

It is an arithmetic number, because the mean of its divisors is an integer number (41666355).

Almost surely, 2^138887845 is an apocalyptic number.

It is an amenable number.

138887845 is a deficient number, since it is larger than the sum of its proper divisors (27777575).

138887845 is an equidigital number, since it uses as much as digits as its factorization.

138887845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27777574.

The product of its digits is 1720320, while the sum is 52.

The square root of 138887845 is about 11785.0687312378. The cubic root of 138887845 is about 517.8707868802.

The spelling of 138887845 in words is "one hundred thirty-eight million, eight hundred eighty-seven thousand, eight hundred forty-five".