1999273 has 2 divisors, whose sum is σ = 1999274. Its totient is φ = 1999272.

The previous prime is 1999247. The next prime is 1999297. The reversal of 1999273 is 3729991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1996569 + 2704 = 1413^2 + 52^2 .

It is an emirp because it is prime and its reverse (3729991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1999273 - 2⁹ = 1998761 is a prime.

It is not a weakly prime, because it can be changed into another prime (1999223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999636 + 999637.

It is an arithmetic number, because the mean of its divisors is an integer number (999637).

2^1999273 is an apocalyptic number.

It is an amenable number.

1999273 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999273 is an equidigital number, since it uses as much as digits as its factorization.

1999273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30618, while the sum is 40.

The square root of 1999273 is about 1413.9565056960. The cubic root of 1999273 is about 125.9768370960.

The spelling of 1999273 in words is "one million, nine hundred ninety-nine thousand, two hundred seventy-three".