138083440 has 40 divisors (see below), whose sum is σ = 350232048. Its totient is φ = 50211840.

The previous prime is 138083437. The next prime is 138083441. The reversal of 138083440 is 44380831.

138083440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138083441) 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, 77577 + ... + 79336.

Almost surely, 2^138083440 is an apocalyptic number.

138083440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138083440 is an abundant number, since it is smaller than the sum of its proper divisors (212148608).

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

138083440 is a wasteful number, since it uses less digits than its factorization.

138083440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156937 (or 156931 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 138083440 is about 11750.8910300453. The cubic root of 138083440 is about 516.8690561007.

The spelling of 138083440 in words is "one hundred thirty-eight million, eighty-three thousand, four hundred forty".