243638386 has 4 divisors (see below), whose sum is σ = 365457582. Its totient is φ = 121819192.

The previous prime is 243638383. The next prime is 243638389. The reversal of 243638386 is 683836342.

243638386 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (243638383) and next prime (243638389).

It can be written as a sum of positive squares in only one way, i.e., 224550225 + 19088161 = 14985^2 + 4369^2 .

It is not an unprimeable number, because it can be changed into a prime (243638383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60909595 + ... + 60909598.

Almost surely, 2^243638386 is an apocalyptic number.

243638386 is a deficient number, since it is larger than the sum of its proper divisors (121819196).

243638386 is a wasteful number, since it uses less digits than its factorization.

243638386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121819195.

The product of its digits is 497664, while the sum is 43.

The square root of 243638386 is about 15608.9200779554. The cubic root of 243638386 is about 624.5711284981.

The spelling of 243638386 in words is "two hundred forty-three million, six hundred thirty-eight thousand, three hundred eighty-six".