138774878 has 16 divisors (see below), whose sum is σ = 230811120. Its totient is φ = 62044800.

The previous prime is 138774871. The next prime is 138774943. The reversal of 138774878 is 878477831.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138774871) 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, 50363 + ... + 53046.

It is an arithmetic number, because the mean of its divisors is an integer number (14425695).

Almost surely, 2^138774878 is an apocalyptic number.

138774878 is a deficient number, since it is larger than the sum of its proper divisors (92036242).

138774878 is a wasteful number, since it uses less digits than its factorization.

138774878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103483.

The product of its digits is 2107392, while the sum is 53.

The square root of 138774878 is about 11780.2749543464. The cubic root of 138774878 is about 517.7303421982.

The spelling of 138774878 in words is "one hundred thirty-eight million, seven hundred seventy-four thousand, eight hundred seventy-eight".