238971660840 has 768 divisors, whose sum is σ = 918162086400. Its totient is φ = 53446041600.

The previous prime is 238971660821. The next prime is 238971660841. The reversal of 238971660840 is 48066179832.

238971660840 is a `hidden beast` number, since 23 + 8 + 9 + 7 + 1 + 6 + 608 + 4 + 0 = 666.

It is not an unprimeable number, because it can be changed into a prime (238971660841) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 1381338994 + ... + 1381339166.

It is an arithmetic number, because the mean of its divisors is an integer number (1195523550).

Almost surely, 2^238971660840 is an apocalyptic number.

238971660840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 238971660840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (459081043200).

238971660840 is an abundant number, since it is smaller than the sum of its proper divisors (679190425560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

238971660840 is a wasteful number, since it uses less digits than its factorization.

238971660840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323 (or 282 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 54.

It can be divided in two parts, 238971 and 660840, that added together give a triangular number (899811 = T₁₃₄₁).

The spelling of 238971660840 in words is "two hundred thirty-eight billion, nine hundred seventy-one million, six hundred sixty thousand, eight hundred forty".