238728395979 has 6 divisors (see below), whose sum is σ = 344829905316. Its totient is φ = 159152263980.

The previous prime is 238728395977. The next prime is 238728395981. The reversal of 238728395979 is 979593827832.

238728395979 is a `hidden beast` number, since 2 + 3 + 8 + 7 + 28 + 3 + 9 + 597 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (238728395977) and next prime (238728395981).

It is not a de Polignac number, because 238728395979 - 2¹ = 238728395977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (238728395977) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13262688657 + ... + 13262688674.

It is an arithmetic number, because the mean of its divisors is an integer number (57471650886).

Almost surely, 2^238728395979 is an apocalyptic number.

238728395979 is a deficient number, since it is larger than the sum of its proper divisors (106101509337).

238728395979 is a wasteful number, since it uses less digits than its factorization.

238728395979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26525377337 (or 26525377334 counting only the distinct ones).

The product of its digits is 411505920, while the sum is 72.

The spelling of 238728395979 in words is "two hundred thirty-eight billion, seven hundred twenty-eight million, three hundred ninety-five thousand, nine hundred seventy-nine".