238609809 has 27 divisors (see below), whose sum is σ = 365100489. Its totient is φ = 150144840.

The previous prime is 238609799. The next prime is 238609831. The reversal of 238609809 is 908906832.

The square root of 238609809 is 15447.

It is a perfect power (a square), and thus also a powerful number.

238609809 is a `hidden beast` number, since 2 + 38 + 609 + 8 + 0 + 9 = 666.

238609809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 238609809 - 2⁷ = 238609681 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (238609849) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 880344 + ... + 880614.

Almost surely, 2^238609809 is an apocalyptic number.

238609809 is the 15447-th square number.

238609809 is the 7724-th centered octagonal number.

It is an amenable number.

238609809 is a deficient number, since it is larger than the sum of its proper divisors (126490680).

238609809 is an equidigital number, since it uses as much as digits as its factorization.

238609809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 586 (or 293 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The cubic root of 238609809 is about 620.2442750595.

Multiplying 238609809 by its product of nonzero digits (186624), we get a square (44530316994816 = 6673104²).

The spelling of 238609809 in words is "two hundred thirty-eight million, six hundred nine thousand, eight hundred nine".