238398721 has 8 divisors (see below), whose sum is σ = 260434944. Its totient is φ = 216423120.

The previous prime is 238398697. The next prime is 238398731. The reversal of 238398721 is 127893832.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 238398721 - 2⁷ = 238398593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (238398731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6721 + ... + 22846.

It is an arithmetic number, because the mean of its divisors is an integer number (32554368).

Almost surely, 2^238398721 is an apocalyptic number.

It is an amenable number.

238398721 is a deficient number, since it is larger than the sum of its proper divisors (22036223).

238398721 is a wasteful number, since it uses less digits than its factorization.

238398721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30311.

The product of its digits is 145152, while the sum is 43.

The square root of 238398721 is about 15440.1658346016. The cubic root of 238398721 is about 620.0613198109.

The spelling of 238398721 in words is "two hundred thirty-eight million, three hundred ninety-eight thousand, seven hundred twenty-one".