8439993 has 6 divisors (see below), whose sum is σ = 12191114. Its totient is φ = 5626656.

The previous prime is 8439989. The next prime is 8440031. The reversal of 8439993 is 3999348.

It can be written as a sum of positive squares in only one way, i.e., 7112889 + 1327104 = 2667^2 + 1152^2 .

It is not a de Polignac number, because 8439993 - 2² = 8439989 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8439953) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 468880 + ... + 468897.

Almost surely, 2^8439993 is an apocalyptic number.

It is an amenable number.

8439993 is a deficient number, since it is larger than the sum of its proper divisors (3751121).

8439993 is a wasteful number, since it uses less digits than its factorization.

8439993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 937783 (or 937780 counting only the distinct ones).

The product of its digits is 209952, while the sum is 45.

The square root of 8439993 is about 2905.1666045169. The cubic root of 8439993 is about 203.6013697683.

The spelling of 8439993 in words is "eight million, four hundred thirty-nine thousand, nine hundred ninety-three".