138158540 has 48 divisors (see below), whose sum is σ = 313309920. Its totient is φ = 50872320.

The previous prime is 138158509. The next prime is 138158543. The reversal of 138158540 is 45851831.

It is a self number, because there is not a number n which added to its sum of digits gives 138158540.

It is not an unprimeable number, because it can be changed into a prime (138158543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 179276 + ... + 180044.

It is an arithmetic number, because the mean of its divisors is an integer number (6527290).

Almost surely, 2^138158540 is an apocalyptic number.

138158540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138158540 is an abundant number, since it is smaller than the sum of its proper divisors (175151380).

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

138158540 is a wasteful number, since it uses less digits than its factorization.

138158540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1482 (or 1480 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 35.

The square root of 138158540 is about 11754.0860980342. The cubic root of 138158540 is about 516.9627430074.

The spelling of 138158540 in words is "one hundred thirty-eight million, one hundred fifty-eight thousand, five hundred forty".