138043889 has 8 divisors (see below), whose sum is σ = 143045760. Its totient is φ = 133123536.

The previous prime is 138043847. The next prime is 138043897. The reversal of 138043889 is 988340831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138043889 - 2¹² = 138039793 is a prime.

It is a super-2 number, since 2×138043889² = 38112230580488642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138073889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16922 + ... + 23715.

It is an arithmetic number, because the mean of its divisors is an integer number (17880720).

Almost surely, 2^138043889 is an apocalyptic number.

It is an amenable number.

138043889 is a deficient number, since it is larger than the sum of its proper divisors (5001871).

138043889 is an equidigital number, since it uses as much as digits as its factorization.

138043889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40759.

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 138043889 is about 11749.2080158622. The cubic root of 138043889 is about 516.8197027529.

The spelling of 138043889 in words is "one hundred thirty-eight million, forty-three thousand, eight hundred eighty-nine".