238723866 has 48 divisors (see below), whose sum is σ = 553431840. Its totient is φ = 74144160.

The previous prime is 238723861. The next prime is 238723879. The reversal of 238723866 is 668327832.

238723866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (238723861) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15141 + ... + 26583.

It is an arithmetic number, because the mean of its divisors is an integer number (11529830).

Almost surely, 2^238723866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 238723866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (276715920).

238723866 is an abundant number, since it is smaller than the sum of its proper divisors (314707974).

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

238723866 is a wasteful number, since it uses less digits than its factorization.

238723866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11531 (or 11528 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The square root of 238723866 is about 15450.6914408385. The cubic root of 238723866 is about 620.3430862144.

The spelling of 238723866 in words is "two hundred thirty-eight million, seven hundred twenty-three thousand, eight hundred sixty-six".