1249979 has 4 divisors (see below), whose sum is σ = 1267176. Its totient is φ = 1232784.

The previous prime is 1249943. The next prime is 1249999. The reversal of 1249979 is 9799421.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1249979 - 2¹² = 1245883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a 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 in 3 ways as a sum of consecutive naturals, for example, 8489 + ... + 8634.

It is an arithmetic number, because the mean of its divisors is an integer number (316794).

2^1249979 is an apocalyptic number.

1249979 is a deficient number, since it is larger than the sum of its proper divisors (17197).

1249979 is an equidigital number, since it uses as much as digits as its factorization.

1249979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17196.

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

The square root of 1249979 is about 1118.0245972249. The cubic root of 1249979 is about 107.7211312565.

The spelling of 1249979 in words is "one million, two hundred forty-nine thousand, nine hundred seventy-nine".