138418878 has 16 divisors (see below), whose sum is σ = 298133136. Its totient is φ = 42590400.

The previous prime is 138418873. The next prime is 138418883. The reversal of 138418878 is 878814831.

It is an interprime number because it is at equal distance from previous prime (138418873) and next prime (138418883).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138418871) 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, 887223 + ... + 887378.

It is an arithmetic number, because the mean of its divisors is an integer number (18633321).

Almost surely, 2^138418878 is an apocalyptic number.

138418878 is an abundant number, since it is smaller than the sum of its proper divisors (159714258).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138418878 is a wasteful number, since it uses less digits than its factorization.

138418878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1774619.

The product of its digits is 344064, while the sum is 48.

The square root of 138418878 is about 11765.1552475945. The cubic root of 138418878 is about 517.2872508764.

The spelling of 138418878 in words is "one hundred thirty-eight million, four hundred eighteen thousand, eight hundred seventy-eight".