1268309818 has 16 divisors (see below), whose sum is σ = 1910313000. Its totient is φ = 631544832.

The previous prime is 1268309813. The next prime is 1268309821. The reversal of 1268309818 is 8189038621.

It can be written as a sum of positive squares in 4 ways, for example, as 1023168169 + 245141649 = 31987^2 + 15657^2 .

It is not an unprimeable number, because it can be changed into a prime (1268309813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 759088 + ... + 760756.

Almost surely, 2^1268309818 is an apocalyptic number.

1268309818 is a deficient number, since it is larger than the sum of its proper divisors (642003182).

1268309818 is a wasteful number, since it uses less digits than its factorization.

1268309818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3009.

The product of its (nonzero) digits is 165888, while the sum is 46.

The square root of 1268309818 is about 35613.3376419566. The cubic root of 1268309818 is about 1082.4515121036.

The spelling of 1268309818 in words is "one billion, two hundred sixty-eight million, three hundred nine thousand, eight hundred eighteen".