400666307 has 2 divisors, whose sum is σ = 400666308. Its totient is φ = 400666306.

The previous prime is 400666237. The next prime is 400666327. The reversal of 400666307 is 703666004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400666307 - 2⁸ = 400666051 is a prime.

It is not a weakly prime, because it can be changed into another prime (400666327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200333153 + 200333154.

It is an arithmetic number, because the mean of its divisors is an integer number (200333154).

Almost surely, 2^400666307 is an apocalyptic number.

400666307 is a deficient number, since it is larger than the sum of its proper divisors (1).

400666307 is an equidigital number, since it uses as much as digits as its factorization.

400666307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 32.

The square root of 400666307 is about 20016.6507438183. The cubic root of 400666307 is about 737.2151887700.

The spelling of 400666307 in words is "four hundred million, six hundred sixty-six thousand, three hundred seven".