400230409 has 2 divisors, whose sum is σ = 400230410. Its totient is φ = 400230408.

The previous prime is 400230407. The next prime is 400230431. The reversal of 400230409 is 904032004.

It is an a-pointer prime, because the next prime (400230431) can be obtained adding 400230409 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 391248400 + 8982009 = 19780^2 + 2997^2 .

It is a cyclic number.

It is not a de Polignac number, because 400230409 - 2¹ = 400230407 is a prime.

Together with 400230407, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 400230409.

It is not a weakly prime, because it can be changed into another prime (400230403) 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, 200115204 + 200115205.

It is an arithmetic number, because the mean of its divisors is an integer number (200115205).

Almost surely, 2^400230409 is an apocalyptic number.

It is an amenable number.

400230409 is a deficient number, since it is larger than the sum of its proper divisors (1).

400230409 is an equidigital number, since it uses as much as digits as its factorization.

400230409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 400230409 is about 20005.7593957340. The cubic root of 400230409 is about 736.9477449086.

The spelling of 400230409 in words is "four hundred million, two hundred thirty thousand, four hundred nine".