8439804493 has 2 divisors, whose sum is σ = 8439804494. Its totient is φ = 8439804492.

The previous prime is 8439804473. The next prime is 8439804497. The reversal of 8439804493 is 3944089348.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8432197929 + 7606564 = 91827^2 + 2758^2 .

It is a cyclic number.

It is not a de Polignac number, because 8439804493 - 2¹⁷ = 8439673421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8439804493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8439804497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4219902246 + 4219902247.

It is an arithmetic number, because the mean of its divisors is an integer number (4219902247).

Almost surely, 2^8439804493 is an apocalyptic number.

It is an amenable number.

8439804493 is a deficient number, since it is larger than the sum of its proper divisors (1).

8439804493 is an equidigital number, since it uses as much as digits as its factorization.

8439804493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2985984, while the sum is 52.

The square root of 8439804493 is about 91868.4085689961. The cubic root of 8439804493 is about 2035.9985394679.

The spelling of 8439804493 in words is "eight billion, four hundred thirty-nine million, eight hundred four thousand, four hundred ninety-three".