806641993 has 16 divisors (see below), whose sum is σ = 893033856. Its totient is φ = 724711680.

The previous prime is 806641991. The next prime is 806641999. The reversal of 806641993 is 399146608.

It is a cyclic number.

It is not a de Polignac number, because 806641993 - 2¹ = 806641991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (806641991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 221455 + ... + 225067.

It is an arithmetic number, because the mean of its divisors is an integer number (55814616).

Almost surely, 2^806641993 is an apocalyptic number.

It is an amenable number.

806641993 is a deficient number, since it is larger than the sum of its proper divisors (86391863).

806641993 is a wasteful number, since it uses less digits than its factorization.

806641993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4224.

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 806641993 is about 28401.4435020476. The cubic root of 806641993 is about 930.8798060259.

The spelling of 806641993 in words is "eight hundred six million, six hundred forty-one thousand, nine hundred ninety-three".