400066697 has 2 divisors, whose sum is σ = 400066698. Its totient is φ = 400066696.

The previous prime is 400066691. The next prime is 400066739. The reversal of 400066697 is 796660004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 246207481 + 153859216 = 15691^2 + 12404^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400066697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400066697.

It is not a weakly prime, because it can be changed into another prime (400066691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200033348 + 200033349.

It is an arithmetic number, because the mean of its divisors is an integer number (200033349).

Almost surely, 2^400066697 is an apocalyptic number.

It is an amenable number.

400066697 is a deficient number, since it is larger than the sum of its proper divisors (1).

400066697 is an equidigital number, since it uses as much as digits as its factorization.

400066697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 400066697 is about 20001.6673554981. The cubic root of 400066697 is about 736.8472497603.

The spelling of 400066697 in words is "four hundred million, sixty-six thousand, six hundred ninety-seven".