400043663 has 4 divisors (see below), whose sum is σ = 409347048. Its totient is φ = 390740280.

The previous prime is 400043653. The next prime is 400043671. The reversal of 400043663 is 366340004.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 400043663 - 2⁴ = 400043647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400043653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4651628 + ... + 4651713.

It is an arithmetic number, because the mean of its divisors is an integer number (102336762).

Almost surely, 2^400043663 is an apocalyptic number.

400043663 is a gapful number since it is divisible by the number (43) formed by its first and last digit.

400043663 is a deficient number, since it is larger than the sum of its proper divisors (9303385).

400043663 is an equidigital number, since it uses as much as digits as its factorization.

400043663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9303384.

The product of its (nonzero) digits is 5184, while the sum is 26.

The square root of 400043663 is about 20001.0915452132. The cubic root of 400043663 is about 736.8331080639.

Adding to 400043663 its reverse (366340004), we get a palindrome (766383667).

The spelling of 400043663 in words is "four hundred million, forty-three thousand, six hundred sixty-three".