1999247 has 2 divisors, whose sum is σ = 1999248. Its totient is φ = 1999246.

The previous prime is 1999243. The next prime is 1999273. The reversal of 1999247 is 7429991.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1999247 - 2² = 1999243 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1999243) 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, 999623 + 999624.

It is an arithmetic number, because the mean of its divisors is an integer number (999624).

2^1999247 is an apocalyptic number.

1999247 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999247 is an equidigital number, since it uses as much as digits as its factorization.

1999247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 41.

The square root of 1999247 is about 1413.9473116068. The cubic root of 1999247 is about 125.9762909955.

The spelling of 1999247 in words is "one million, nine hundred ninety-nine thousand, two hundred forty-seven".