138155458 has 16 divisors (see below), whose sum is σ = 238569984. Its totient is φ = 58776480.

The previous prime is 138155453. The next prime is 138155461. The reversal of 138155458 is 854551831.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 138155458.

It is not an unprimeable number, because it can be changed into a prime (138155453) 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 7 ways as a sum of consecutive naturals, for example, 34098 + ... + 37933.

It is an arithmetic number, because the mean of its divisors is an integer number (14910624).

Almost surely, 2^138155458 is an apocalyptic number.

138155458 is a deficient number, since it is larger than the sum of its proper divisors (100414526).

138155458 is a wasteful number, since it uses less digits than its factorization.

138155458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72177.

The product of its digits is 96000, while the sum is 40.

The square root of 138155458 is about 11753.9549939584. The cubic root of 138155458 is about 516.9588988947.

The spelling of 138155458 in words is "one hundred thirty-eight million, one hundred fifty-five thousand, four hundred fifty-eight".