400401343 has 2 divisors, whose sum is σ = 400401344. Its totient is φ = 400401342.

The previous prime is 400401329. The next prime is 400401349. The reversal of 400401343 is 343104004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400401343 - 2⁵ = 400401311 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400401343.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400401349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200200671 + 200200672.

It is an arithmetic number, because the mean of its divisors is an integer number (200200672).

Almost surely, 2^400401343 is an apocalyptic number.

400401343 is a deficient number, since it is larger than the sum of its proper divisors (1).

400401343 is an equidigital number, since it uses as much as digits as its factorization.

400401343 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 400401343 is about 20010.0310594462. The cubic root of 400401343 is about 737.0526440649.

Adding to 400401343 its reverse (343104004), we get a palindrome (743505347).

The spelling of 400401343 in words is "four hundred million, four hundred one thousand, three hundred forty-three".