404395684477 has 2 divisors, whose sum is σ = 404395684478. Its totient is φ = 404395684476.

The previous prime is 404395684313. The next prime is 404395684501. The reversal of 404395684477 is 774486593404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 390661250841 + 13734433636 = 625029^2 + 117194^2 .

It is a cyclic number.

It is not a de Polignac number, because 404395684477 - 2¹¹ = 404395682429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404395684177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202197842238 + 202197842239.

It is an arithmetic number, because the mean of its divisors is an integer number (202197842239).

Almost surely, 2^404395684477 is an apocalyptic number.

It is an amenable number.

404395684477 is a deficient number, since it is larger than the sum of its proper divisors (1).

404395684477 is an equidigital number, since it uses as much as digits as its factorization.

404395684477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81285120, while the sum is 61.

The spelling of 404395684477 in words is "four hundred four billion, three hundred ninety-five million, six hundred eighty-four thousand, four hundred seventy-seven".