238821749 has 2 divisors, whose sum is σ = 238821750. Its totient is φ = 238821748.

The previous prime is 238821689. The next prime is 238821787. The reversal of 238821749 is 947128832.

238821749 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., 222159025 + 16662724 = 14905^2 + 4082^2 .

It is a cyclic number.

It is not a de Polignac number, because 238821749 - 2¹² = 238817653 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (238829749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119410874 + 119410875.

It is an arithmetic number, because the mean of its divisors is an integer number (119410875).

Almost surely, 2^238821749 is an apocalyptic number.

It is an amenable number.

238821749 is a deficient number, since it is larger than the sum of its proper divisors (1).

238821749 is an equidigital number, since it uses as much as digits as its factorization.

238821749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 44.

The square root of 238821749 is about 15453.8587090733. The cubic root of 238821749 is about 620.4278602341.

The spelling of 238821749 in words is "two hundred thirty-eight million, eight hundred twenty-one thousand, seven hundred forty-nine".