400443 has 4 divisors (see below), whose sum is σ = 533928. Its totient is φ = 266960.

The previous prime is 400441. The next prime is 400457. The reversal of 400443 is 344004.

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 400443 - 2¹ = 400441 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (400441) 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, 66738 + ... + 66743.

It is an arithmetic number, because the mean of its divisors is an integer number (133482).

2⁴⁰⁰⁴⁴³ is an apocalyptic number.

400443 is a deficient number, since it is larger than the sum of its proper divisors (133485).

400443 is a wasteful number, since it uses less digits than its factorization.

400443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133484.

The product of its (nonzero) digits is 192, while the sum is 15.

The square root of 400443 is about 632.8056573704. The cubic root of 400443 is about 73.7078203701.

Adding to 400443 its reverse (344004), we get a palindrome (744447).

The spelling of 400443 in words is "four hundred thousand, four hundred forty-three", and thus it is an iban number.