235712820138 has 32 divisors (see below), whose sum is σ = 496558248000. Its totient is φ = 74387517696.

The previous prime is 235712820137. The next prime is 235712820229. The reversal of 235712820138 is 831028217532.

235712820138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 235712820138.

It is not an unprimeable number, because it can be changed into a prime (235712820137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 490831 + ... + 844002.

It is an arithmetic number, because the mean of its divisors is an integer number (15517445250).

Almost surely, 2^235712820138 is an apocalyptic number.

235712820138 is an abundant number, since it is smaller than the sum of its proper divisors (260845427862).

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

235712820138 is a wasteful number, since it uses less digits than its factorization.

235712820138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1336406.

The product of its (nonzero) digits is 161280, while the sum is 42.

The spelling of 235712820138 in words is "two hundred thirty-five billion, seven hundred twelve million, eight hundred twenty thousand, one hundred thirty-eight".