238928809 has 4 divisors (see below), whose sum is σ = 273061504. Its totient is φ = 204796116.

The previous prime is 238928803. The next prime is 238928821. The reversal of 238928809 is 908829832.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 238928809 - 2⁷ = 238928681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (238928803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17066337 + ... + 17066350.

It is an arithmetic number, because the mean of its divisors is an integer number (68265376).

Almost surely, 2^238928809 is an apocalyptic number.

It is an amenable number.

238928809 is a deficient number, since it is larger than the sum of its proper divisors (34132695).

238928809 is an equidigital number, since it uses as much as digits as its factorization.

238928809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34132694.

The product of its (nonzero) digits is 497664, while the sum is 49.

The square root of 238928809 is about 15457.3221807660. The cubic root of 238928809 is about 620.5205557054.

The spelling of 238928809 in words is "two hundred thirty-eight million, nine hundred twenty-eight thousand, eight hundred nine".