138227860 has 24 divisors (see below), whose sum is σ = 290686536. Its totient is φ = 55213440.

The previous prime is 138227839. The next prime is 138227897. The reversal of 138227860 is 68722831.

It can be written as a sum of positive squares in 4 ways, for example, as 2598544 + 135629316 = 1612^2 + 11646^2 .

It is a super-3 number, since 3×138227860³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10990 + ... + 19930.

It is an arithmetic number, because the mean of its divisors is an integer number (12111939).

Almost surely, 2^138227860 is an apocalyptic number.

138227860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138227860 is an abundant number, since it is smaller than the sum of its proper divisors (152458676).

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

138227860 is a wasteful number, since it uses less digits than its factorization.

138227860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9723 (or 9721 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 138227860 is about 11757.0344900404. The cubic root of 138227860 is about 517.0491892634.

The spelling of 138227860 in words is "one hundred thirty-eight million, two hundred twenty-seven thousand, eight hundred sixty".