403944 has 16 divisors (see below), whose sum is σ = 1009920. Its totient is φ = 134640.

The previous prime is 403933. The next prime is 403951. The reversal of 403944 is 449304.

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 16831 = 403944 / (4 + 0 + 3 + 9 + 4 + 4).

It is an unprimeable number.

403944 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8392 + ... + 8439.

It is an arithmetic number, because the mean of its divisors is an integer number (63120).

2⁴⁰³⁹⁴⁴ is an apocalyptic number.

It is an amenable number.

403944 is an abundant number, since it is smaller than the sum of its proper divisors (605976).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

403944 is a wasteful number, since it uses less digits than its factorization.

403944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16840 (or 16836 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 403944 is about 635.5658895819. The cubic root of 403944 is about 73.9220020634.

The spelling of 403944 in words is "four hundred three thousand, nine hundred forty-four".