242638392409 has 4 divisors (see below), whose sum is σ = 277301019904. Its totient is φ = 207975764916.

The previous prime is 242638392407. The next prime is 242638392413. The reversal of 242638392409 is 904293836242.

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, and also an emirpimes, since its reverse is a distinct semiprime: 904293836242 = 2 ⋅452146918121.

It is a cyclic number.

It is not a de Polignac number, because 242638392409 - 2¹ = 242638392407 is a prime.

It is a super-4 number, since 4×242638392409⁴ (a number of 47 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (242638392401) 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 in 3 ways as a sum of consecutive naturals, for example, 17331313737 + ... + 17331313750.

It is an arithmetic number, because the mean of its divisors is an integer number (69325254976).

Almost surely, 2^242638392409 is an apocalyptic number.

It is an amenable number.

242638392409 is a deficient number, since it is larger than the sum of its proper divisors (34662627495).

242638392409 is an equidigital number, since it uses as much as digits as its factorization.

242638392409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34662627494.

The product of its (nonzero) digits is 4478976, while the sum is 52.

The spelling of 242638392409 in words is "two hundred forty-two billion, six hundred thirty-eight million, three hundred ninety-two thousand, four hundred nine".