138256266 has 48 divisors (see below), whose sum is σ = 296071776. Its totient is φ = 43014048.

The previous prime is 138256229. The next prime is 138256267. The reversal of 138256266 is 662652831.

It is a super-2 number, since 2×138256266² = 38229590176525512, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138256267) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 135976 + ... + 136988.

It is an arithmetic number, because the mean of its divisors is an integer number (6168162).

Almost surely, 2^138256266 is an apocalyptic number.

138256266 is an abundant number, since it is smaller than the sum of its proper divisors (157815510).

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

138256266 is a wasteful number, since it uses less digits than its factorization.

138256266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1107 (or 1084 counting only the distinct ones).

The product of its digits is 103680, while the sum is 39.

The square root of 138256266 is about 11758.2424707096. The cubic root of 138256266 is about 517.0846049249.

The spelling of 138256266 in words is "one hundred thirty-eight million, two hundred fifty-six thousand, two hundred sixty-six".