819205493 has 12 divisors (see below), whose sum is σ = 846901440. Its totient is φ = 792374832.

The previous prime is 819205481. The next prime is 819205507. The reversal of 819205493 is 394502918.

It is not a de Polignac number, because 819205493 - 2¹⁴ = 819189109 is a prime.

It is a super-2 number, since 2×819205493² = 1342195279522746098, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 819205493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (819205403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 243380 + ... + 246722.

It is an arithmetic number, because the mean of its divisors is an integer number (70575120).

Almost surely, 2^819205493 is an apocalyptic number.

It is an amenable number.

819205493 is a deficient number, since it is larger than the sum of its proper divisors (27695947).

819205493 is a wasteful number, since it uses less digits than its factorization.

819205493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3596 (or 3559 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 819205493 is about 28621.7660705974. The cubic root of 819205493 is about 935.6877675814.

The spelling of 819205493 in words is "eight hundred nineteen million, two hundred five thousand, four hundred ninety-three".