1278383005 has 4 divisors (see below), whose sum is σ = 1534059612. Its totient is φ = 1022706400.

The previous prime is 1278383003. The next prime is 1278383027. The reversal of 1278383005 is 5003838721.

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 156200004 + 1122183001 = 12498^2 + 33499^2 .

It is not a de Polignac number, because 1278383005 - 2¹ = 1278383003 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278383003) 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, 127838296 + ... + 127838305.

It is an arithmetic number, because the mean of its divisors is an integer number (383514903).

Almost surely, 2^1278383005 is an apocalyptic number.

It is an amenable number.

1278383005 is a deficient number, since it is larger than the sum of its proper divisors (255676607).

1278383005 is an equidigital number, since it uses as much as digits as its factorization.

1278383005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255676606.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 1278383005 is about 35754.4823064186. The cubic root of 1278383005 is about 1085.3096456722.

The spelling of 1278383005 in words is "one billion, two hundred seventy-eight million, three hundred eighty-three thousand, five".