403966861 has 2 divisors, whose sum is σ = 403966862. Its totient is φ = 403966860.

The previous prime is 403966853. The next prime is 403966907. The reversal of 403966861 is 168669304.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 403768836 + 198025 = 20094^2 + 445^2 .

It is a cyclic number.

It is not a de Polignac number, because 403966861 - 2³ = 403966853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (403966261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201983430 + 201983431.

It is an arithmetic number, because the mean of its divisors is an integer number (201983431).

Almost surely, 2^403966861 is an apocalyptic number.

It is an amenable number.

403966861 is a deficient number, since it is larger than the sum of its proper divisors (1).

403966861 is an equidigital number, since it uses as much as digits as its factorization.

403966861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 43.

The square root of 403966861 is about 20098.9268618999. The cubic root of 403966861 is about 739.2339656284.

The spelling of 403966861 in words is "four hundred three million, nine hundred sixty-six thousand, eight hundred sixty-one".