1278455873 has 8 divisors (see below), whose sum is σ = 1299994920. Its totient is φ = 1256935680.

The previous prime is 1278455863. The next prime is 1278455951. The reversal of 1278455873 is 3785548721.

It can be written as a sum of positive squares in 4 ways, for example, as 102171664 + 1176284209 = 10108^2 + 34297^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1278455873 - 2⁸ = 1278455617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1278455813) 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, 222683 + ... + 228351.

It is an arithmetic number, because the mean of its divisors is an integer number (162499365).

Almost surely, 2^1278455873 is an apocalyptic number.

It is an amenable number.

1278455873 is a deficient number, since it is larger than the sum of its proper divisors (21539047).

1278455873 is an equidigital number, since it uses as much as digits as its factorization.

1278455873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9427.

The product of its digits is 1881600, while the sum is 50.

The square root of 1278455873 is about 35755.5012970032. The cubic root of 1278455873 is about 1085.3302662115.

The spelling of 1278455873 in words is "one billion, two hundred seventy-eight million, four hundred fifty-five thousand, eight hundred seventy-three".