138154439 has 8 divisors (see below), whose sum is σ = 139372800. Its totient is φ = 136940256.

The previous prime is 138154417. The next prime is 138154477. The reversal of 138154439 is 934451831.

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 138154439 - 2⁸ = 138154183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138154409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126554 + ... + 127640.

It is an arithmetic number, because the mean of its divisors is an integer number (17421600).

Almost surely, 2^138154439 is an apocalyptic number.

138154439 is a deficient number, since it is larger than the sum of its proper divisors (1218361).

138154439 is a wasteful number, since it uses less digits than its factorization.

138154439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2089.

The product of its digits is 51840, while the sum is 38.

The square root of 138154439 is about 11753.9116467668. The cubic root of 138154439 is about 516.9576279052.

The spelling of 138154439 in words is "one hundred thirty-eight million, one hundred fifty-four thousand, four hundred thirty-nine".