1267999 has 2 divisors, whose sum is σ = 1268000. Its totient is φ = 1267998.

The previous prime is 1267961. The next prime is 1268011. The reversal of 1267999 is 9997621.

It is a strong prime.

It is an emirp because it is prime and its reverse (9997621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1267999 - 2¹⁹ = 743711 is a prime.

It is a plaindrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1267939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633999 + 634000.

It is an arithmetic number, because the mean of its divisors is an integer number (634000).

2^1267999 is an apocalyptic number.

1267999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1267999 is an equidigital number, since it uses as much as digits as its factorization.

1267999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61236, while the sum is 43.

The square root of 1267999 is about 1126.0546167926. The cubic root of 1267999 is about 108.2363081318.

The spelling of 1267999 in words is "one million, two hundred sixty-seven thousand, nine hundred ninety-nine".