1405999169 has 2 divisors, whose sum is σ = 1405999170. Its totient is φ = 1405999168.

The previous prime is 1405999163. The next prime is 1405999171. The reversal of 1405999169 is 9619995041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 840130225 + 565868944 = 28985^2 + 23788^2 .

It is a cyclic number.

It is not a de Polignac number, because 1405999169 - 2²⁰ = 1404950593 is a prime.

It is a super-2 number, since 2×1405999169² = 3953667326457381122, which contains 22 as substring.

Together with 1405999171, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1405999169.

It is not a weakly prime, because it can be changed into another prime (1405999163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 702999584 + 702999585.

It is an arithmetic number, because the mean of its divisors is an integer number (702999585).

Almost surely, 2^1405999169 is an apocalyptic number.

It is an amenable number.

1405999169 is a deficient number, since it is larger than the sum of its proper divisors (1).

1405999169 is an equidigital number, since it uses as much as digits as its factorization.

1405999169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 787320, while the sum is 53.

The square root of 1405999169 is about 37496.6554375187. The cubic root of 1405999169 is about 1120.2845708127.

The spelling of 1405999169 in words is "one billion, four hundred five million, nine hundred ninety-nine thousand, one hundred sixty-nine".