403868681 has 2 divisors, whose sum is σ = 403868682. Its totient is φ = 403868680.

The previous prime is 403868671. The next prime is 403868683. The reversal of 403868681 is 186868304.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 385729600 + 18139081 = 19640^2 + 4259^2 .

It is a cyclic number.

It is not a de Polignac number, because 403868681 - 2¹⁴ = 403852297 is a prime.

It is a super-2 number, since 2×403868681² = 326219822985359522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 403868683, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (403868683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201934340 + 201934341.

It is an arithmetic number, because the mean of its divisors is an integer number (201934341).

Almost surely, 2^403868681 is an apocalyptic number.

It is an amenable number.

403868681 is a deficient number, since it is larger than the sum of its proper divisors (1).

403868681 is an equidigital number, since it uses as much as digits as its factorization.

403868681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 221184, while the sum is 44.

The square root of 403868681 is about 20096.4842945228. The cubic root of 403868681 is about 739.1740730329.

The spelling of 403868681 in words is "four hundred three million, eight hundred sixty-eight thousand, six hundred eighty-one".