1278187345 has 8 divisors (see below), whose sum is σ = 1536552576. Its totient is φ = 1020731376.

The previous prime is 1278187343. The next prime is 1278187363. The reversal of 1278187345 is 5437818721.

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 1278187345 - 2¹ = 1278187343 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1278187295 and 1278187304.

It is not an unprimeable number, because it can be changed into a prime (1278187343) 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, 224217 + ... + 229846.

It is an arithmetic number, because the mean of its divisors is an integer number (192069072).

Almost surely, 2^1278187345 is an apocalyptic number.

It is an amenable number.

1278187345 is a deficient number, since it is larger than the sum of its proper divisors (258365231).

1278187345 is an equidigital number, since it uses as much as digits as its factorization.

1278187345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454631.

The product of its digits is 376320, while the sum is 46.

The square root of 1278187345 is about 35751.7460412775. The cubic root of 1278187345 is about 1085.2542729816.

The spelling of 1278187345 in words is "one billion, two hundred seventy-eight million, one hundred eighty-seven thousand, three hundred forty-five".