1249238873 has 4 divisors (see below), whose sum is σ = 1249374948. Its totient is φ = 1249102800.

The previous prime is 1249238839. The next prime is 1249238911. The reversal of 1249238873 is 3788329421.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 785568784 + 463670089 = 28028^2 + 21533^2 .

It is a cyclic number.

It is not a de Polignac number, because 1249238873 - 2¹⁶ = 1249173337 is a prime.

It is a super-3 number, since 3×1249238873³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1249238833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53186 + ... + 72987.

It is an arithmetic number, because the mean of its divisors is an integer number (312343737).

Almost surely, 2^1249238873 is an apocalyptic number.

It is an amenable number.

1249238873 is a deficient number, since it is larger than the sum of its proper divisors (136075).

1249238873 is an equidigital number, since it uses as much as digits as its factorization.

1249238873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136074.

The product of its digits is 580608, while the sum is 47.

The square root of 1249238873 is about 35344.5734590191. The cubic root of 1249238873 is about 1076.9986608359.

The spelling of 1249238873 in words is "one billion, two hundred forty-nine million, two hundred thirty-eight thousand, eight hundred seventy-three".