138504040 has 32 divisors (see below), whose sum is σ = 312147360. Its totient is φ = 55310400.

The previous prime is 138504019. The next prime is 138504071. The reversal of 138504040 is 40405831.

It is a junction number, because it is equal to n+sod(n) for n = 138503996 and 138504014.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 25135 + ... + 30145.

It is an arithmetic number, because the mean of its divisors is an integer number (9754605).

Almost surely, 2^138504040 is an apocalyptic number.

138504040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138504040 is an abundant number, since it is smaller than the sum of its proper divisors (173643320).

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

138504040 is a wasteful number, since it uses less digits than its factorization.

138504040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5713 (or 5709 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 138504040 is about 11768.7739378408. The cubic root of 138504040 is about 517.3933158536.

Adding to 138504040 its reverse (40405831), we get a palindrome (178909871).

The spelling of 138504040 in words is "one hundred thirty-eight million, five hundred four thousand, forty".