400316243 has 2 divisors, whose sum is σ = 400316244. Its totient is φ = 400316242.

The previous prime is 400316179. The next prime is 400316269. The reversal of 400316243 is 342613004.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400316243 - 2⁶ = 400316179 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (400315243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200158121 + 200158122.

It is an arithmetic number, because the mean of its divisors is an integer number (200158122).

Almost surely, 2^400316243 is an apocalyptic number.

400316243 is a deficient number, since it is larger than the sum of its proper divisors (1).

400316243 is an equidigital number, since it uses as much as digits as its factorization.

400316243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 400316243 is about 20007.9045129669. The cubic root of 400316243 is about 737.0004234407. Note that the first 3 decimals are identical.

Adding to 400316243 its reverse (342613004), we get a palindrome (742929247).

The spelling of 400316243 in words is "four hundred million, three hundred sixteen thousand, two hundred forty-three".