400423443 has 12 divisors (see below), whose sum is σ = 621065160. Its totient is φ = 228813312.

The previous prime is 400423433. The next prime is 400423487. The reversal of 400423443 is 344324004.

It is a happy number.

It is not a de Polignac number, because 400423443 - 2⁶ = 400423379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (400423433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1361838 + ... + 1362131.

It is an arithmetic number, because the mean of its divisors is an integer number (51755430).

Almost surely, 2^400423443 is an apocalyptic number.

400423443 is a deficient number, since it is larger than the sum of its proper divisors (220641717).

400423443 is a wasteful number, since it uses less digits than its factorization.

400423443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2723986 (or 2723979 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 24.

The square root of 400423443 is about 20010.5832748573. The cubic root of 400423443 is about 737.0662042623.

Adding to 400423443 its reverse (344324004), we get a palindrome (744747447).

The spelling of 400423443 in words is "four hundred million, four hundred twenty-three thousand, four hundred forty-three".