138155392 has 16 divisors (see below), whose sum is σ = 275231700. Its totient is φ = 69077632.

The previous prime is 138155389. The next prime is 138155393. The reversal of 138155392 is 293551831.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138155393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 539542 + ... + 539797.

Almost surely, 2^138155392 is an apocalyptic number.

It is an amenable number.

138155392 is a deficient number, since it is larger than the sum of its proper divisors (137076308).

138155392 is an equidigital number, since it uses as much as digits as its factorization.

138155392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079353 (or 1079341 counting only the distinct ones).

The product of its digits is 32400, while the sum is 37.

The square root of 138155392 is about 11753.9521863925. The cubic root of 138155392 is about 516.9588165736.

The spelling of 138155392 in words is "one hundred thirty-eight million, one hundred fifty-five thousand, three hundred ninety-two".