238478551 has 4 divisors (see below), whose sum is σ = 238511952. Its totient is φ = 238445152.

The previous prime is 238478507. The next prime is 238478573. The reversal of 238478551 is 155874832.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 238478551 - 2¹¹ = 238476503 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 238478498 and 238478507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (238478351) 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 in 3 ways as a sum of consecutive naturals, for example, 1186 + ... + 21871.

It is an arithmetic number, because the mean of its divisors is an integer number (59627988).

Almost surely, 2^238478551 is an apocalyptic number.

238478551 is a deficient number, since it is larger than the sum of its proper divisors (33401).

238478551 is a wasteful number, since it uses less digits than its factorization.

238478551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33400.

The product of its digits is 268800, while the sum is 43.

The square root of 238478551 is about 15442.7507588512. The cubic root of 238478551 is about 620.1305231619.

The spelling of 238478551 in words is "two hundred thirty-eight million, four hundred seventy-eight thousand, five hundred fifty-one".