1268605439 has 4 divisors (see below), whose sum is σ = 1269048960. Its totient is φ = 1268161920.

The previous prime is 1268605427. The next prime is 1268605469. The reversal of 1268605439 is 9345068621.

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

It is a cyclic number.

It is not a de Polignac number, because 1268605439 - 2⁴ = 1268605423 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1268605439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1268605409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217442 + ... + 223199.

It is an arithmetic number, because the mean of its divisors is an integer number (317262240).

Almost surely, 2^1268605439 is an apocalyptic number.

1268605439 is a deficient number, since it is larger than the sum of its proper divisors (443521).

1268605439 is an equidigital number, since it uses as much as digits as its factorization.

1268605439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443520.

The product of its (nonzero) digits is 311040, while the sum is 44.

The square root of 1268605439 is about 35617.4878255050. The cubic root of 1268605439 is about 1082.5356057889.

The spelling of 1268605439 in words is "one billion, two hundred sixty-eight million, six hundred five thousand, four hundred thirty-nine".