138038680 has 32 divisors (see below), whose sum is σ = 334479600. Its totient is φ = 50967936.

The previous prime is 138038647. The next prime is 138038683. The reversal of 138038680 is 86830831.

It is a super-2 number, since 2×138038680² = 38109354352284800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138038683) 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, 132210 + ... + 133249.

Almost surely, 2^138038680 is an apocalyptic number.

138038680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138038680 is an abundant number, since it is smaller than the sum of its proper divisors (196440920).

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

138038680 is a wasteful number, since it uses less digits than its factorization.

138038680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265483 (or 265479 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 138038680 is about 11748.9863392550. The cubic root of 138038680 is about 516.8132020481.

The spelling of 138038680 in words is "one hundred thirty-eight million, thirty-eight thousand, six hundred eighty".