138349689 has 16 divisors (see below), whose sum is σ = 195654528. Its totient is φ = 86657792.

The previous prime is 138349649. The next prime is 138349711. The reversal of 138349689 is 986943831.

138349689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 138349689 - 2⁸ = 138349433 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (138349639) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32524 + ... + 36530.

It is an arithmetic number, because the mean of its divisors is an integer number (12228408).

Almost surely, 2^138349689 is an apocalyptic number.

It is an amenable number.

138349689 is a deficient number, since it is larger than the sum of its proper divisors (57304839).

138349689 is a wasteful number, since it uses less digits than its factorization.

138349689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4704.

The product of its digits is 1119744, while the sum is 51.

The square root of 138349689 is about 11762.2144598711. The cubic root of 138349689 is about 517.2010474310.

The spelling of 138349689 in words is "one hundred thirty-eight million, three hundred forty-nine thousand, six hundred eighty-nine".