402440420461 has 2 divisors, whose sum is σ = 402440420462. Its totient is φ = 402440420460.

The previous prime is 402440420399. The next prime is 402440420513. The reversal of 402440420461 is 164024044204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 235991924100 + 166448496361 = 485790^2 + 407981^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402440420461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402440420561) 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, 201220210230 + 201220210231.

It is an arithmetic number, because the mean of its divisors is an integer number (201220210231).

Almost surely, 2^402440420461 is an apocalyptic number.

It is an amenable number.

402440420461 is a deficient number, since it is larger than the sum of its proper divisors (1).

402440420461 is an equidigital number, since it uses as much as digits as its factorization.

402440420461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24576, while the sum is 31.

Adding to 402440420461 its reverse (164024044204), we get a palindrome (566464464665).

The spelling of 402440420461 in words is "four hundred two billion, four hundred forty million, four hundred twenty thousand, four hundred sixty-one".