4002404242391 has 2 divisors, whose sum is σ = 4002404242392. Its totient is φ = 4002404242390.

The previous prime is 4002404242379. The next prime is 4002404242481. The reversal of 4002404242391 is 1932424042004.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4002404242391 - 2¹⁸ = 4002403980247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4002401242391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2001202121195 + 2001202121196.

It is an arithmetic number, because the mean of its divisors is an integer number (2001202121196).

Almost surely, 2^{4002404242391} is an apocalyptic number.

4002404242391 is a deficient number, since it is larger than the sum of its proper divisors (1).

4002404242391 is an equidigital number, since it uses as much as digits as its factorization.

4002404242391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 55296, while the sum is 35.

Adding to 4002404242391 its reverse (1932424042004), we get a palindrome (5934828284395).

The spelling of 4002404242391 in words is "four trillion, two billion, four hundred four million, two hundred forty-two thousand, three hundred ninety-one".