243427657 has 4 divisors (see below), whose sum is σ = 265557456. Its totient is φ = 221297860.

The previous prime is 243427621. The next prime is 243427663. The reversal of 243427657 is 756724342.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 243427657 - 2⁷ = 243427529 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (243427057) 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, 11064883 + ... + 11064904.

It is an arithmetic number, because the mean of its divisors is an integer number (66389364).

Almost surely, 2^243427657 is an apocalyptic number.

It is an amenable number.

243427657 is a deficient number, since it is larger than the sum of its proper divisors (22129799).

243427657 is a wasteful number, since it uses less digits than its factorization.

243427657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22129798.

The product of its digits is 282240, while the sum is 40.

The square root of 243427657 is about 15602.1683428939. The cubic root of 243427657 is about 624.3910074376.

The spelling of 243427657 in words is "two hundred forty-three million, four hundred twenty-seven thousand, six hundred fifty-seven".