238650781 has 2 divisors, whose sum is σ = 238650782. Its totient is φ = 238650780.

The previous prime is 238650761. The next prime is 238650793. The reversal of 238650781 is 187056832.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 223951225 + 14699556 = 14965^2 + 3834^2 .

It is a cyclic number.

It is not a de Polignac number, because 238650781 - 2¹¹ = 238648733 is a prime.

It is a super-2 number, since 2×238650781² = 113908390543819922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (238650721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119325390 + 119325391.

It is an arithmetic number, because the mean of its divisors is an integer number (119325391).

Almost surely, 2^238650781 is an apocalyptic number.

It is an amenable number.

238650781 is a deficient number, since it is larger than the sum of its proper divisors (1).

238650781 is an equidigital number, since it uses as much as digits as its factorization.

238650781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 238650781 is about 15448.3261552830. The cubic root of 238650781 is about 620.2797740109.

The spelling of 238650781 in words is "two hundred thirty-eight million, six hundred fifty thousand, seven hundred eighty-one".