1268139204 has 18 divisors (see below), whose sum is σ = 3205574190. Its totient is φ = 422713056.

The previous prime is 1268139181. The next prime is 1268139209. The reversal of 1268139204 is 4029318621.

1268139204 is a `hidden beast` number, since 1 + 268 + 1 + 392 + 0 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1267217604 + 921600 = 35598^2 + 960^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 35226089 = 1268139204 / (1 + 2 + 6 + 8 + 1 + 3 + 9 + 2 + 0 + 4).

It is not an unprimeable number, because it can be changed into a prime (1268139209) 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 5 ways as a sum of consecutive naturals, for example, 17613009 + ... + 17613080.

It is an arithmetic number, because the mean of its divisors is an integer number (178087455).

Almost surely, 2^1268139204 is an apocalyptic number.

It is an amenable number.

1268139204 is an abundant number, since it is smaller than the sum of its proper divisors (1937434986).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1268139204 is a wasteful number, since it uses less digits than its factorization.

1268139204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35226099 (or 35226094 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 1268139204 is about 35610.9421947805. The cubic root of 1268139204 is about 1082.4029725272.

The spelling of 1268139204 in words is "one billion, two hundred sixty-eight million, one hundred thirty-nine thousand, two hundred four".