999405493 has 2 divisors, whose sum is σ = 999405494. Its totient is φ = 999405492.

The previous prime is 999405487. The next prime is 999405553. The reversal of 999405493 is 394504999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 749828689 + 249576804 = 27383^2 + 15798^2 .

It is a cyclic number.

It is not a de Polignac number, because 999405493 - 2⁵ = 999405461 is a prime.

It is a super-2 number, since 2×999405493² = 1997622678877146098, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 999405493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999405193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499702746 + 499702747.

It is an arithmetic number, because the mean of its divisors is an integer number (499702747).

Almost surely, 2^999405493 is an apocalyptic number.

It is an amenable number.

999405493 is a deficient number, since it is larger than the sum of its proper divisors (1).

999405493 is an equidigital number, since it uses as much as digits as its factorization.

999405493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1574640, while the sum is 52.

The square root of 999405493 is about 31613.3752231552. The cubic root of 999405493 is about 999.8017917161.

The spelling of 999405493 in words is "nine hundred ninety-nine million, four hundred five thousand, four hundred ninety-three".