138378208 has 24 divisors (see below), whose sum is σ = 273067200. Its totient is φ = 69027840.

The previous prime is 138378193. The next prime is 138378211. The reversal of 138378208 is 802873831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9553 + ... + 19183.

It is an arithmetic number, because the mean of its divisors is an integer number (11377800).

Almost surely, 2^138378208 is an apocalyptic number.

It is an amenable number.

138378208 is a deficient number, since it is larger than the sum of its proper divisors (134688992).

138378208 is an equidigital number, since it uses as much as digits as its factorization.

138378208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10090 (or 10082 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 138378208 is about 11763.4267116347. The cubic root of 138378208 is about 517.2365830928.

The spelling of 138378208 in words is "one hundred thirty-eight million, three hundred seventy-eight thousand, two hundred eight".