403998 has 16 divisors (see below), whose sum is σ = 923520. Its totient is φ = 115416.

The previous prime is 403993. The next prime is 404009. The reversal of 403998 is 899304.

It is a Curzon number.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (403993) by changing a digit.

403998 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 7 ways as a sum of consecutive naturals, for example, 4768 + ... + 4851.

It is an arithmetic number, because the mean of its divisors is an integer number (57720).

2⁴⁰³⁹⁹⁸ is an apocalyptic number.

403998 is an abundant number, since it is smaller than the sum of its proper divisors (519522).

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

403998 is a wasteful number, since it uses less digits than its factorization.

403998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9631.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 403998 is about 635.6083699889. The cubic root of 403998 is about 73.9252959278.

The spelling of 403998 in words is "four hundred three thousand, nine hundred ninety-eight".