858366493 has 2 divisors, whose sum is σ = 858366494. Its totient is φ = 858366492.

The previous prime is 858366491. The next prime is 858366497. The reversal of 858366493 is 394663858.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 781593849 + 76772644 = 27957^2 + 8762^2 .

It is a cyclic number.

It is not a de Polignac number, because 858366493 - 2¹ = 858366491 is a prime.

Together with 858366491, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 858366493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (858366491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 429183246 + 429183247.

It is an arithmetic number, because the mean of its divisors is an integer number (429183247).

Almost surely, 2^858366493 is an apocalyptic number.

It is an amenable number.

858366493 is a deficient number, since it is larger than the sum of its proper divisors (1).

858366493 is an equidigital number, since it uses as much as digits as its factorization.

858366493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3732480, while the sum is 52.

The square root of 858366493 is about 29297.8922962045. The cubic root of 858366493 is about 950.3660613290.

It can be divided in two parts, 85836 and 6493, that added together give a palindrome (92329).

The spelling of 858366493 in words is "eight hundred fifty-eight million, three hundred sixty-six thousand, four hundred ninety-three".