138434379 has 8 divisors (see below), whose sum is σ = 186213072. Its totient is φ = 91472640.

The previous prime is 138434347. The next prime is 138434407. The reversal of 138434379 is 973434831.

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

It is not a de Polignac number, because 138434379 - 2⁵ = 138434347 is a prime.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 138434379.

It is not an unprimeable number, because it can be changed into a prime (138430379) 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 7 ways as a sum of consecutive naturals, for example, 203842 + ... + 204519.

It is an arithmetic number, because the mean of its divisors is an integer number (23276634).

Almost surely, 2^138434379 is an apocalyptic number.

138434379 is a deficient number, since it is larger than the sum of its proper divisors (47778693).

138434379 is a wasteful number, since it uses less digits than its factorization.

138434379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408477.

The product of its digits is 217728, while the sum is 42.

The square root of 138434379 is about 11765.8139964900. The cubic root of 138434379 is about 517.3065598283.

The spelling of 138434379 in words is "one hundred thirty-eight million, four hundred thirty-four thousand, three hundred seventy-nine".