238721247 has 6 divisors (see below), whose sum is σ = 344819592. Its totient is φ = 159147492.

The previous prime is 238721239. The next prime is 238721269. The reversal of 238721247 is 742127832.

It is not a de Polignac number, because 238721247 - 2³ = 238721239 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (238721207) 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 5 ways as a sum of consecutive naturals, for example, 13262283 + ... + 13262300.

It is an arithmetic number, because the mean of its divisors is an integer number (57469932).

Almost surely, 2^238721247 is an apocalyptic number.

238721247 is a deficient number, since it is larger than the sum of its proper divisors (106098345).

238721247 is a wasteful number, since it uses less digits than its factorization.

238721247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26524589 (or 26524586 counting only the distinct ones).

The product of its digits is 37632, while the sum is 36.

The square root of 238721247 is about 15450.6066871175. The cubic root of 238721247 is about 620.3408176457.

The spelling of 238721247 in words is "two hundred thirty-eight million, seven hundred twenty-one thousand, two hundred forty-seven".