400070009 has 2 divisors, whose sum is σ = 400070010. Its totient is φ = 400070008.

The previous prime is 400069997. The next prime is 400070017. The reversal of 400070009 is 900070004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 237252409 + 162817600 = 15403^2 + 12760^2 .

It is a cyclic number.

It is not a de Polignac number, because 400070009 - 2⁸ = 400069753 is a prime.

It is not a weakly prime, because it can be changed into another prime (400070039) 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, 200035004 + 200035005.

It is an arithmetic number, because the mean of its divisors is an integer number (200035005).

Almost surely, 2^400070009 is an apocalyptic number.

It is an amenable number.

400070009 is a deficient number, since it is larger than the sum of its proper divisors (1).

400070009 is an equidigital number, since it uses as much as digits as its factorization.

400070009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 400070009 is about 20001.7501484245. The cubic root of 400070009 is about 736.8492831140.

The spelling of 400070009 in words is "four hundred million, seventy thousand, nine".