400043 has 4 divisors (see below), whose sum is σ = 457200. Its totient is φ = 342888.

The previous prime is 400033. The next prime is 400051. The reversal of 400043 is 340004.

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

It is not a de Polignac number, because 400043 - 2⁶ = 399979 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 399997 and 400033.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 400043.

It is not an unprimeable number, because it can be changed into a prime (400033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28568 + ... + 28581.

It is an arithmetic number, because the mean of its divisors is an integer number (114300).

2⁴⁰⁰⁰⁴³ is an apocalyptic number.

400043 is a deficient number, since it is larger than the sum of its proper divisors (57157).

400043 is an equidigital number, since it uses as much as digits as its factorization.

400043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57156.

The product of its (nonzero) digits is 48, while the sum is 11.

The square root of 400043 is about 632.4895256050. The cubic root of 400043 is about 73.6832701008.

Adding to 400043 its reverse (340004), we get a palindrome (740047).

The spelling of 400043 in words is "four hundred thousand, forty-three", and thus it is an iban number.