138408340 has 36 divisors (see below), whose sum is σ = 338114196. Its totient is φ = 47453952.

The previous prime is 138408337. The next prime is 138408343. The reversal of 138408340 is 43804831.

It is an interprime number because it is at equal distance from previous prime (138408337) and next prime (138408343).

It can be written as a sum of positive squares in 2 ways, for example, as 34245904 + 104162436 = 5852^2 + 10206^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138408343) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69637 + ... + 71596.

It is an arithmetic number, because the mean of its divisors is an integer number (9392061).

Almost surely, 2^138408340 is an apocalyptic number.

138408340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138408340 is an abundant number, since it is smaller than the sum of its proper divisors (199705856).

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

138408340 is a wasteful number, since it uses less digits than its factorization.

138408340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141256 (or 141247 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 138408340 is about 11764.7073911764. The cubic root of 138408340 is about 517.2741233044.

The spelling of 138408340 in words is "one hundred thirty-eight million, four hundred eight thousand, three hundred forty".