404840844487 has 2 divisors, whose sum is σ = 404840844488. Its totient is φ = 404840844486.

The previous prime is 404840844379. The next prime is 404840844503. The reversal of 404840844487 is 784448048404.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-404840844487 is a prime.

It is a super-2 number, since 2×404840844487² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404840844787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202420422243 + 202420422244.

It is an arithmetic number, because the mean of its divisors is an integer number (202420422244).

Almost surely, 2^404840844487 is an apocalyptic number.

404840844487 is a deficient number, since it is larger than the sum of its proper divisors (1).

404840844487 is an equidigital number, since it uses as much as digits as its factorization.

404840844487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14680064, while the sum is 55.

The spelling of 404840844487 in words is "four hundred four billion, eight hundred forty million, eight hundred forty-four thousand, four hundred eighty-seven".