1658396493 has 18 divisors (see below), whose sum is σ = 2593904586. Its totient is φ = 1020550752.

The previous prime is 1658396483. The next prime is 1658396497. The reversal of 1658396493 is 3946938561.

1658396493 is a `hidden beast` number, since 1 + 65 + 8 + 3 + 96 + 493 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 187060329 + 1471336164 = 13677^2 + 38358^2 .

It is not a de Polignac number, because 1658396493 - 2⁴ = 1658396477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1658396497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 543646 + ... + 546687.

Almost surely, 2^1658396493 is an apocalyptic number.

1658396493 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1658396493 is a deficient number, since it is larger than the sum of its proper divisors (935508093).

1658396493 is a wasteful number, since it uses less digits than its factorization.

1658396493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090365 (or 1090349 counting only the distinct ones).

The product of its digits is 4199040, while the sum is 54.

The square root of 1658396493 is about 40723.4145547743. The cubic root of 1658396493 is about 1183.6667738161. Note that the first 3 decimals are identical.

The spelling of 1658396493 in words is "one billion, six hundred fifty-eight million, three hundred ninety-six thousand, four hundred ninety-three".