403993 has 2 divisors, whose sum is σ = 403994. Its totient is φ = 403992.

The previous prime is 403981. The next prime is 404009. The reversal of 403993 is 399304.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 375769 + 28224 = 613^2 + 168^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-403993 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (403933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201996 + 201997.

It is an arithmetic number, because the mean of its divisors is an integer number (201997).

2⁴⁰³⁹⁹³ is an apocalyptic number.

It is an amenable number.

403993 is a deficient number, since it is larger than the sum of its proper divisors (1).

403993 is an equidigital number, since it uses as much as digits as its factorization.

403993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 28.

The square root of 403993 is about 635.6044367372. The cubic root of 403993 is about 73.9249909527.

The spelling of 403993 in words is "four hundred three thousand, nine hundred ninety-three".