138540830 has 16 divisors (see below), whose sum is σ = 257973120. Its totient is φ = 53505312.

The previous prime is 138540827. The next prime is 138540833. The reversal of 138540830 is 38045831.

It is a happy number.

138540830 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (138540827) and next prime (138540833).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138540833) 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, 238574 + ... + 239153.

It is an arithmetic number, because the mean of its divisors is an integer number (16123320).

Almost surely, 2^138540830 is an apocalyptic number.

138540830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138540830 is a deficient number, since it is larger than the sum of its proper divisors (119432290).

138540830 is a wasteful number, since it uses less digits than its factorization.

138540830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477763.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 138540830 is about 11770.3368685862. The cubic root of 138540830 is about 517.4391224956.

The spelling of 138540830 in words is "one hundred thirty-eight million, five hundred forty thousand, eight hundred thirty".