8431993 has 2 divisors, whose sum is σ = 8431994. Its totient is φ = 8431992.

The previous prime is 8431987. The next prime is 8432003. The reversal of 8431993 is 3991348.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6335289 + 2096704 = 2517^2 + 1448^2 .

It is a cyclic number.

It is not a de Polignac number, because 8431993 - 2¹³ = 8423801 is a prime.

8431993 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (8431903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4215996 + 4215997.

It is an arithmetic number, because the mean of its divisors is an integer number (4215997).

Almost surely, 2^8431993 is an apocalyptic number.

It is an amenable number.

8431993 is a deficient number, since it is larger than the sum of its proper divisors (1).

8431993 is an equidigital number, since it uses as much as digits as its factorization.

8431993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 37.

The square root of 8431993 is about 2903.7894207397. The cubic root of 8431993 is about 203.5370203523.

The spelling of 8431993 in words is "eight million, four hundred thirty-one thousand, nine hundred ninety-three".