400336243 has 2 divisors, whose sum is σ = 400336244. Its totient is φ = 400336242.

The previous prime is 400336231. The next prime is 400336267. The reversal of 400336243 is 342633004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400336243 - 2⁹ = 400335731 is a prime.

It is equal to p_21353281 and since 400336243 and 21353281 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (400336273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200168121 + 200168122.

It is an arithmetic number, because the mean of its divisors is an integer number (200168122).

Almost surely, 2^400336243 is an apocalyptic number.

400336243 is a deficient number, since it is larger than the sum of its proper divisors (1).

400336243 is an equidigital number, since it uses as much as digits as its factorization.

400336243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 25.

The square root of 400336243 is about 20008.4043091897. The cubic root of 400336243 is about 737.0126968731.

Adding to 400336243 its reverse (342633004), we get a palindrome (742969247).

The spelling of 400336243 in words is "four hundred million, three hundred thirty-six thousand, two hundred forty-three".