242400643 has 2 divisors, whose sum is σ = 242400644. Its totient is φ = 242400642.

The previous prime is 242400619. The next prime is 242400649. The reversal of 242400643 is 346004242.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 242400643 - 2⁹ = 242400131 is a prime.

It is not a weakly prime, because it can be changed into another prime (242400649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121200321 + 121200322.

It is an arithmetic number, because the mean of its divisors is an integer number (121200322).

Almost surely, 2^242400643 is an apocalyptic number.

242400643 is a deficient number, since it is larger than the sum of its proper divisors (1).

242400643 is an equidigital number, since it uses as much as digits as its factorization.

242400643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 25.

The square root of 242400643 is about 15569.2210145530. The cubic root of 242400643 is about 623.5116739904.

Adding to 242400643 its reverse (346004242), we get a palindrome (588404885).

The spelling of 242400643 in words is "two hundred forty-two million, four hundred thousand, six hundred forty-three".