138533040 has 60 divisors (see below), whose sum is σ = 465242544. Its totient is φ = 36941952.

The previous prime is 138533011. The next prime is 138533053. The reversal of 138533040 is 40335831.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (60).

It is a junction number, because it is equal to n+sod(n) for n = 138532995 and 138533013.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 95484 + ... + 96923.

Almost surely, 2^138533040 is an apocalyptic number.

138533040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138533040 is an abundant number, since it is smaller than the sum of its proper divisors (326709504).

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

138533040 is a wasteful number, since it uses less digits than its factorization.

138533040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192426 (or 192417 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 138533040 is about 11770.0059473222. The cubic root of 138533040 is about 517.4294239677.

Adding to 138533040 its reverse (40335831), we get a palindrome (178868871).

The spelling of 138533040 in words is "one hundred thirty-eight million, five hundred thirty-three thousand, forty".