138164878 has 8 divisors (see below), whose sum is σ = 210645000. Its totient is φ = 67949880.

The previous prime is 138164863. The next prime is 138164879. The reversal of 138164878 is 878461831.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138164879) 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 3 ways as a sum of consecutive naturals, for example, 566128 + ... + 566371.

It is an arithmetic number, because the mean of its divisors is an integer number (26330625).

Almost surely, 2^138164878 is an apocalyptic number.

138164878 is a deficient number, since it is larger than the sum of its proper divisors (72480122).

138164878 is a wasteful number, since it uses less digits than its factorization.

138164878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1132562.

The product of its digits is 258048, while the sum is 46.

The square root of 138164878 is about 11754.3557033127. The cubic root of 138164878 is about 516.9706480798.

The spelling of 138164878 in words is "one hundred thirty-eight million, one hundred sixty-four thousand, eight hundred seventy-eight".