400447 has 4 divisors (see below), whose sum is σ = 410256. Its totient is φ = 390640.

The previous prime is 400441. The next prime is 400457. The reversal of 400447 is 744004.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400447 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4843 + ... + 4924.

It is an arithmetic number, because the mean of its divisors is an integer number (102564).

2⁴⁰⁰⁴⁴⁷ is an apocalyptic number.

400447 is a deficient number, since it is larger than the sum of its proper divisors (9809).

400447 is an equidigital number, since it uses as much as digits as its factorization.

400447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9808.

The product of its (nonzero) digits is 448, while the sum is 19.

The square root of 400447 is about 632.8088178905. The cubic root of 400447 is about 73.7080657902.

The spelling of 400447 in words is "four hundred thousand, four hundred forty-seven", and thus it is an iban number.