238638451 has 2 divisors, whose sum is σ = 238638452. Its totient is φ = 238638450.

The previous prime is 238638431. The next prime is 238638479. The reversal of 238638451 is 154836832.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 238638451 - 2⁹ = 238637939 is a prime.

It is not a weakly prime, because it can be changed into another prime (238638431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119319225 + 119319226.

It is an arithmetic number, because the mean of its divisors is an integer number (119319226).

Almost surely, 2^238638451 is an apocalyptic number.

238638451 is a deficient number, since it is larger than the sum of its proper divisors (1).

238638451 is an equidigital number, since it uses as much as digits as its factorization.

238638451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 138240, while the sum is 40.

The square root of 238638451 is about 15447.9270777668. The cubic root of 238638451 is about 620.2690914824.

The spelling of 238638451 in words is "two hundred thirty-eight million, six hundred thirty-eight thousand, four hundred fifty-one".