242645786 has 4 divisors (see below), whose sum is σ = 363968682. Its totient is φ = 121322892.

The previous prime is 242645783. The next prime is 242645803. The reversal of 242645786 is 687546242.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 687546242 = 2 ⋅343773121.

It can be written as a sum of positive squares in only one way, i.e., 158281561 + 84364225 = 12581^2 + 9185^2 .

It is not an unprimeable number, because it can be changed into a prime (242645783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60661445 + ... + 60661448.

Almost surely, 2^242645786 is an apocalyptic number.

242645786 is a deficient number, since it is larger than the sum of its proper divisors (121322896).

242645786 is a wasteful number, since it uses less digits than its factorization.

242645786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121322895.

The product of its digits is 645120, while the sum is 44.

The square root of 242645786 is about 15577.0917054500. The cubic root of 242645786 is about 623.7217917292.

The spelling of 242645786 in words is "two hundred forty-two million, six hundred forty-five thousand, seven hundred eighty-six".