236721138 has 8 divisors (see below), whose sum is σ = 473442288. Its totient is φ = 78907044.

The previous prime is 236721137. The next prime is 236721169. The reversal of 236721138 is 831127632.

236721138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

236721138 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 236721099 and 236721108.

It is not an unprimeable number, because it can be changed into a prime (236721137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19726756 + ... + 19726767.

It is an arithmetic number, because the mean of its divisors is an integer number (59180286).

Almost surely, 2^236721138 is an apocalyptic number.

236721138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

236721138 is a wasteful number, since it uses less digits than its factorization.

236721138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39453528.

The product of its digits is 12096, while the sum is 33.

The square root of 236721138 is about 15385.7446358634. The cubic root of 236721138 is about 618.6034626560.

The spelling of 236721138 in words is "two hundred thirty-six million, seven hundred twenty-one thousand, one hundred thirty-eight".