1249999 has 2 divisors, whose sum is σ = 1250000.
Its totient is φ = 1249998.
The previous prime is 1249943. The next prime is 1250003. The reversal of 1249999 is 9999421.
It can be divided in two parts, 1 and 249999, that added together give a square (250000 = 5002).
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 1249999 - 29 = 1249487 is a prime.
1249999 is a modest number, since divided by 9999 gives 124 as remainder.
1249999 is a lucky number.
It is a plaindrome in base 10 and base 14.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (1249939) 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, 624999 + 625000.
It is an arithmetic number, because the mean of its divisors is an integer number (625000).
21249999 is an apocalyptic number.
1249999 is a deficient number, since it is larger than the sum of its proper divisors (1).
1249999 is an equidigital number, since it uses as much as digits as its factorization.
1249999 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 52488, while the sum is 43.
The square root of 1249999 is about 1118.0335415362.
The cubic root of 1249999 is about 107.7217057758.
The spelling of 1249999 in words is "one million, two hundred forty-nine thousand, nine hundred ninety-nine".