138257286 has 8 divisors (see below), whose sum is σ = 276514584. Its totient is φ = 46085760.

The previous prime is 138257263. The next prime is 138257321. The reversal of 138257286 is 682752831.

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

138257286 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11521435 + ... + 11521446.

It is an arithmetic number, because the mean of its divisors is an integer number (34564323).

Almost surely, 2^138257286 is an apocalyptic number.

138257286 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

138257286 is a wasteful number, since it uses less digits than its factorization.

138257286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23042886.

The product of its digits is 161280, while the sum is 42.

The square root of 138257286 is about 11758.2858444588. The cubic root of 138257286 is about 517.0858765370.

The spelling of 138257286 in words is "one hundred thirty-eight million, two hundred fifty-seven thousand, two hundred eighty-six".