400002443 has 2 divisors, whose sum is σ = 400002444. Its totient is φ = 400002442.

The previous prime is 400002433. The next prime is 400002461. The reversal of 400002443 is 344200004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400002443 - 2¹⁶ = 399936907 is a prime.

It is not a weakly prime, because it can be changed into another prime (400002403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200001221 + 200001222.

It is an arithmetic number, because the mean of its divisors is an integer number (200001222).

Almost surely, 2^400002443 is an apocalyptic number.

400002443 is a deficient number, since it is larger than the sum of its proper divisors (1).

400002443 is an equidigital number, since it uses as much as digits as its factorization.

400002443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 400002443 is about 20000.0610749067. The cubic root of 400002443 is about 736.8077997398.

Adding to 400002443 its reverse (344200004), we get a palindrome (744202447).

The spelling of 400002443 in words is "four hundred million, two thousand, four hundred forty-three".