1249085939 has 4 divisors (see below), whose sum is σ = 1254312480. Its totient is φ = 1243859400.

The previous prime is 1249085861. The next prime is 1249085953. The reversal of 1249085939 is 9395809421.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9395809421 = 107 ⋅87811303.

It is a cyclic number.

It is not a de Polignac number, because 1249085939 - 2¹² = 1249081843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1249085969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2612912 + ... + 2613389.

It is an arithmetic number, because the mean of its divisors is an integer number (313578120).

Almost surely, 2^1249085939 is an apocalyptic number.

1249085939 is a deficient number, since it is larger than the sum of its proper divisors (5226541).

1249085939 is an equidigital number, since it uses as much as digits as its factorization.

1249085939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5226540.

The product of its (nonzero) digits is 699840, while the sum is 50.

The square root of 1249085939 is about 35342.4099206605. The cubic root of 1249085939 is about 1076.9547096913.

The spelling of 1249085939 in words is "one billion, two hundred forty-nine million, eighty-five thousand, nine hundred thirty-nine".