138878282 has 8 divisors (see below), whose sum is σ = 209595936. Its totient is φ = 69012972.

The previous prime is 138878269. The next prime is 138878293. The reversal of 138878282 is 282878831.

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

It is a super-2 number, since 2×138878282² = 38574354422543048, which contains 22 as substring.

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, 212678 + ... + 213329.

It is an arithmetic number, because the mean of its divisors is an integer number (26199492).

Almost surely, 2^138878282 is an apocalyptic number.

138878282 is a deficient number, since it is larger than the sum of its proper divisors (70717654).

138878282 is a wasteful number, since it uses less digits than its factorization.

138878282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426172.

The product of its digits is 344064, while the sum is 47.

The square root of 138878282 is about 11784.6629990000. The cubic root of 138878282 is about 517.8589007621.

The spelling of 138878282 in words is "one hundred thirty-eight million, eight hundred seventy-eight thousand, two hundred eighty-two".