238723861 has 2 divisors, whose sum is σ = 238723862. Its totient is φ = 238723860.

The previous prime is 238723829. The next prime is 238723879. The reversal of 238723861 is 168327832.

238723861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 227708100 + 11015761 = 15090^2 + 3319^2 .

It is a cyclic number.

It is not a de Polignac number, because 238723861 - 2⁵ = 238723829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (238720861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119361930 + 119361931.

It is an arithmetic number, because the mean of its divisors is an integer number (119361931).

Almost surely, 2^238723861 is an apocalyptic number.

It is an amenable number.

238723861 is a deficient number, since it is larger than the sum of its proper divisors (1).

238723861 is an equidigital number, since it uses as much as digits as its factorization.

238723861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 40.

The square root of 238723861 is about 15450.6912790334. The cubic root of 238723861 is about 620.3430818834.

The spelling of 238723861 in words is "two hundred thirty-eight million, seven hundred twenty-three thousand, eight hundred sixty-one".