1243214857 has 4 divisors (see below), whose sum is σ = 1252289556. Its totient is φ = 1234140160.

The previous prime is 1243214851. The next prime is 1243214867. The reversal of 1243214857 is 7584123421.

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 793605241 + 449609616 = 28171^2 + 21204^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243214857 - 2¹⁹ = 1242690569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243214851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4537144 + ... + 4537417.

It is an arithmetic number, because the mean of its divisors is an integer number (313072389).

Almost surely, 2^1243214857 is an apocalyptic number.

It is an amenable number.

1243214857 is a deficient number, since it is larger than the sum of its proper divisors (9074699).

1243214857 is an equidigital number, since it uses as much as digits as its factorization.

1243214857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9074698.

The product of its digits is 53760, while the sum is 37.

The square root of 1243214857 is about 35259.2520765827. The cubic root of 1243214857 is about 1075.2647213937.

The spelling of 1243214857 in words is "one billion, two hundred forty-three million, two hundred fourteen thousand, eight hundred fifty-seven".