238543421 has 2 divisors, whose sum is σ = 238543422. Its totient is φ = 238543420.

The previous prime is 238543399. The next prime is 238543447. The reversal of 238543421 is 124345832.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130279396 + 108264025 = 11414^2 + 10405^2 .

It is a cyclic number.

It is not a de Polignac number, because 238543421 - 2²² = 234349117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (238546421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119271710 + 119271711.

It is an arithmetic number, because the mean of its divisors is an integer number (119271711).

Almost surely, 2^238543421 is an apocalyptic number.

It is an amenable number.

238543421 is a deficient number, since it is larger than the sum of its proper divisors (1).

238543421 is an equidigital number, since it uses as much as digits as its factorization.

238543421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23040, while the sum is 32.

The square root of 238543421 is about 15444.8509542825. The cubic root of 238543421 is about 620.1867465551.

The spelling of 238543421 in words is "two hundred thirty-eight million, five hundred forty-three thousand, four hundred twenty-one".