1999069 has 2 divisors, whose sum is σ = 1999070. Its totient is φ = 1999068.

The previous prime is 1999061. The next prime is 1999099. The reversal of 1999069 is 9609991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1996569 + 2500 = 1413^2 + 50^2 .

It is a cyclic number.

It is not a de Polignac number, because 1999069 - 2³ = 1999061 is a prime.

It is a super-2 number, since 2×1999069² = 7992553733522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1999061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999534 + 999535.

It is an arithmetic number, because the mean of its divisors is an integer number (999535).

2^1999069 is an apocalyptic number.

It is an amenable number.

1999069 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999069 is an equidigital number, since it uses as much as digits as its factorization.

1999069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 39366, while the sum is 43.

The square root of 1999069 is about 1413.8843658517. The cubic root of 1999069 is about 125.9725521803.

The spelling of 1999069 in words is "one million, nine hundred ninety-nine thousand, sixty-nine".