242746639 has 2 divisors, whose sum is σ = 242746640. Its totient is φ = 242746638.

The previous prime is 242746619. The next prime is 242746643. The reversal of 242746639 is 936647242.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 242746639 - 2⁵ = 242746607 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 242746595 and 242746604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242746619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121373319 + 121373320.

It is an arithmetic number, because the mean of its divisors is an integer number (121373320).

Almost surely, 2^242746639 is an apocalyptic number.

242746639 is a deficient number, since it is larger than the sum of its proper divisors (1).

242746639 is an equidigital number, since it uses as much as digits as its factorization.

242746639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 43.

The square root of 242746639 is about 15580.3285908867. The cubic root of 242746639 is about 623.8081940824.

The spelling of 242746639 in words is "two hundred forty-two million, seven hundred forty-six thousand, six hundred thirty-nine".