136438 has 4 divisors (see below), whose sum is σ = 204660. Its totient is φ = 68218.

The previous prime is 136429. The next prime is 136447. The reversal of 136438 is 834631.

136438 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 834631 = 7 ⋅119233.

It is an interprime number because it is at equal distance from previous prime (136429) and next prime (136447).

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34108 + ... + 34111.

It is an arithmetic number, because the mean of its divisors is an integer number (51165).

2¹³⁶⁴³⁸ is an apocalyptic number.

136438 is a deficient number, since it is larger than the sum of its proper divisors (68222).

136438 is an equidigital number, since it uses as much as digits as its factorization.

136438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68221.

The product of its digits is 1728, while the sum is 25.

The square root of 136438 is about 369.3751480541. The cubic root of 136438 is about 51.4807795810.

The spelling of 136438 in words is "one hundred thirty-six thousand, four hundred thirty-eight".