400442 has 8 divisors (see below), whose sum is σ = 686496. Its totient is φ = 171612.

The previous prime is 400441. The next prime is 400457. The reversal of 400442 is 244004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (14), and also a Moran number because the ratio is a prime number: 28603 = 400442 / (4 + 0 + 0 + 4 + 4 + 2).

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, 14288 + ... + 14315.

It is an arithmetic number, because the mean of its divisors is an integer number (85812).

2⁴⁰⁰⁴⁴² is an apocalyptic number.

400442 is a deficient number, since it is larger than the sum of its proper divisors (286054).

400442 is a wasteful number, since it uses less digits than its factorization.

400442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28612.

The product of its (nonzero) digits is 128, while the sum is 14.

The square root of 400442 is about 632.8048672379. The cubic root of 400442 is about 73.7077590148.

Adding to 400442 its reverse (244004), we get a palindrome (644446).

The spelling of 400442 in words is "four hundred thousand, four hundred forty-two", and thus it is an iban number.