138539140 has 24 divisors (see below), whose sum is σ = 294618240. Its totient is φ = 54713568.

The previous prime is 138539131. The next prime is 138539147. The reversal of 138539140 is 41935831.

It is a junction number, because it is equal to n+sod(n) for n = 138539096 and 138539105.

It is not an unprimeable number, because it can be changed into a prime (138539147) 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, 42262 + ... + 45421.

It is an arithmetic number, because the mean of its divisors is an integer number (12275760).

Almost surely, 2^138539140 is an apocalyptic number.

138539140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138539140 is an abundant number, since it is smaller than the sum of its proper divisors (156079100).

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

138539140 is a wasteful number, since it uses less digits than its factorization.

138539140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87771 (or 87769 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 138539140 is about 11770.2650777287. The cubic root of 138539140 is about 517.4370184813.

The spelling of 138539140 in words is "one hundred thirty-eight million, five hundred thirty-nine thousand, one hundred forty".