242636689 has 4 divisors (see below), whose sum is σ = 242784256. Its totient is φ = 242489124.

The previous prime is 242636687. The next prime is 242636741. The reversal of 242636689 is 986636242.

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 242636689 - 2¹ = 242636687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (242636687) 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, 71289 + ... + 74614.

It is an arithmetic number, because the mean of its divisors is an integer number (60696064).

Almost surely, 2^242636689 is an apocalyptic number.

It is an amenable number.

242636689 is a deficient number, since it is larger than the sum of its proper divisors (147567).

242636689 is a wasteful number, since it uses less digits than its factorization.

242636689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147566.

The product of its digits is 746496, while the sum is 46.

The square root of 242636689 is about 15576.7997034051. The cubic root of 242636689 is about 623.7139970090.

The spelling of 242636689 in words is "two hundred forty-two million, six hundred thirty-six thousand, six hundred eighty-nine".