1999366493 has 2 divisors, whose sum is σ = 1999366494. Its totient is φ = 1999366492.

The previous prime is 1999366489. The next prime is 1999366507. The reversal of 1999366493 is 3946639991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1925629924 + 73736569 = 43882^2 + 8587^2 .

It is a cyclic number.

It is not a de Polignac number, because 1999366493 - 2² = 1999366489 is a prime.

It is a super-2 number, since 2×1999366493² = 7994932746662238098, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1999366403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999683246 + 999683247.

It is an arithmetic number, because the mean of its divisors is an integer number (999683247).

Almost surely, 2^1999366493 is an apocalyptic number.

It is an amenable number.

1999366493 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999366493 is an equidigital number, since it uses as much as digits as its factorization.

1999366493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8503056, while the sum is 59.

The square root of 1999366493 is about 44714.2761654485. The cubic root of 1999366493 is about 1259.7880077126.

The spelling of 1999366493 in words is "one billion, nine hundred ninety-nine million, three hundred sixty-six thousand, four hundred ninety-three".