138982840 has 32 divisors (see below), whose sum is σ = 313436880. Its totient is φ = 55464192.

The previous prime is 138982817. The next prime is 138982843. The reversal of 138982840 is 48289831.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138982843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14479 + ... + 22081.

Almost surely, 2^138982840 is an apocalyptic number.

138982840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138982840 is an abundant number, since it is smaller than the sum of its proper divisors (174454040).

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

138982840 is a wasteful number, since it uses less digits than its factorization.

138982840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8071 (or 8067 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 43.

The square root of 138982840 is about 11789.0983539879. The cubic root of 138982840 is about 517.9888291842.

The spelling of 138982840 in words is "one hundred thirty-eight million, nine hundred eighty-two thousand, eight hundred forty".