238666643 has 4 divisors (see below), whose sum is σ = 238699200. Its totient is φ = 238634088.

The previous prime is 238666639. The next prime is 238666667. The reversal of 238666643 is 346666832.

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 238666643 - 2² = 238666639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 238666594 and 238666603.

It is not an unprimeable number, because it can be changed into a prime (238666843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 446 + ... + 21852.

It is an arithmetic number, because the mean of its divisors is an integer number (59674800).

Almost surely, 2^238666643 is an apocalyptic number.

238666643 is a deficient number, since it is larger than the sum of its proper divisors (32557).

238666643 is a wasteful number, since it uses less digits than its factorization.

238666643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32556.

The product of its digits is 746496, while the sum is 44.

The square root of 238666643 is about 15448.8395357062. The cubic root of 238666643 is about 620.2935160706.

The spelling of 238666643 in words is "two hundred thirty-eight million, six hundred sixty-six thousand, six hundred forty-three".