1244666386 has 8 divisors (see below), whose sum is σ = 1868831244. Its totient is φ = 621722640.

The previous prime is 1244666369. The next prime is 1244666393. The reversal of 1244666386 is 6836664421.

It can be written as a sum of positive squares in 2 ways, for example, as 1199306161 + 45360225 = 34631^2 + 6735^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 302725 + ... + 306808.

Almost surely, 2^1244666386 is an apocalyptic number.

1244666386 is a deficient number, since it is larger than the sum of its proper divisors (624164858).

1244666386 is a wasteful number, since it uses less digits than its factorization.

1244666386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610556.

The product of its digits is 995328, while the sum is 46.

The square root of 1244666386 is about 35279.8297331492. The cubic root of 1244666386 is about 1075.6830376314.

The spelling of 1244666386 in words is "one billion, two hundred forty-four million, six hundred sixty-six thousand, three hundred eighty-six".