136138438 has 4 divisors (see below), whose sum is σ = 204207660. Its totient is φ = 68069218.

The previous prime is 136138423. The next prime is 136138451. The reversal of 136138438 is 834831631.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 136138397 and 136138406.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34034608 + ... + 34034611.

It is an arithmetic number, because the mean of its divisors is an integer number (51051915).

Almost surely, 2^136138438 is an apocalyptic number.

136138438 is a deficient number, since it is larger than the sum of its proper divisors (68069222).

136138438 is an equidigital number, since it uses as much as digits as its factorization.

136138438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68069221.

The product of its digits is 41472, while the sum is 37.

The square root of 136138438 is about 11667.8377602708. The cubic root of 136138438 is about 514.4307506648.

The spelling of 136138438 in words is "one hundred thirty-six million, one hundred thirty-eight thousand, four hundred thirty-eight".