138941478 has 24 divisors (see below), whose sum is σ = 324197328. Its totient is φ = 42751152.

The previous prime is 138941477. The next prime is 138941483. The reversal of 138941478 is 874149831.

It is a happy number.

138941478 is a `hidden beast` number, since 138 + 9 + 41 + 478 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138941477) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 296650 + ... + 297117.

It is an arithmetic number, because the mean of its divisors is an integer number (13508222).

Almost surely, 2^138941478 is an apocalyptic number.

138941478 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

138941478 is an abundant number, since it is smaller than the sum of its proper divisors (185255850).

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

138941478 is a wasteful number, since it uses less digits than its factorization.

138941478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593788 (or 593785 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 138941478 is about 11787.3439756376. The cubic root of 138941478 is about 517.9374387159.

The spelling of 138941478 in words is "one hundred thirty-eight million, nine hundred forty-one thousand, four hundred seventy-eight".