138924889 has 4 divisors (see below), whose sum is σ = 138948480. Its totient is φ = 138901300.

The previous prime is 138924883. The next prime is 138924893. The reversal of 138924889 is 988429831.

138924889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 988429831 = 3557 ⋅277883.

It is a cyclic number.

It is not a de Polignac number, because 138924889 - 2⁹ = 138924377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138924883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5232 + ... + 17470.

It is an arithmetic number, because the mean of its divisors is an integer number (34737120).

Almost surely, 2^138924889 is an apocalyptic number.

It is an amenable number.

138924889 is a deficient number, since it is larger than the sum of its proper divisors (23591).

138924889 is a wasteful number, since it uses less digits than its factorization.

138924889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23590.

The product of its digits is 995328, while the sum is 52.

The square root of 138924889 is about 11786.6402761771. The cubic root of 138924889 is about 517.9168247465.

It can be divided in two parts, 13892 and 4889, that added together give a palindrome (18781).

The spelling of 138924889 in words is "one hundred thirty-eight million, nine hundred twenty-four thousand, eight hundred eighty-nine".