238525409 has 2 divisors, whose sum is σ = 238525410. Its totient is φ = 238525408.

The previous prime is 238525393. The next prime is 238525447. The reversal of 238525409 is 904525832.

It is an a-pointer prime, because the next prime (238525447) can be obtained adding 238525409 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124099600 + 114425809 = 11140^2 + 10697^2 .

It is a cyclic number.

It is not a de Polignac number, because 238525409 - 2⁴ = 238525393 is a prime.

It is not a weakly prime, because it can be changed into another prime (238525009) 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, 119262704 + 119262705.

It is an arithmetic number, because the mean of its divisors is an integer number (119262705).

Almost surely, 2^238525409 is an apocalyptic number.

It is an amenable number.

238525409 is a deficient number, since it is larger than the sum of its proper divisors (1).

238525409 is an equidigital number, since it uses as much as digits as its factorization.

238525409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 86400, while the sum is 38.

The square root of 238525409 is about 15444.2678363204. The cubic root of 238525409 is about 620.1711364203.

The spelling of 238525409 in words is "two hundred thirty-eight million, five hundred twenty-five thousand, four hundred nine".