1278487347 has 8 divisors (see below), whose sum is σ = 1709709456. Its totient is φ = 849795072.

The previous prime is 1278487339. The next prime is 1278487369. The reversal of 1278487347 is 7437848721.

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

It is not a de Polignac number, because 1278487347 - 2³ = 1278487339 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1278487347.

It is not an unprimeable number, because it can be changed into a prime (1278487387) 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, 631278 + ... + 633299.

It is an arithmetic number, because the mean of its divisors is an integer number (213713682).

Almost surely, 2^1278487347 is an apocalyptic number.

1278487347 is a deficient number, since it is larger than the sum of its proper divisors (431222109).

1278487347 is a wasteful number, since it uses less digits than its factorization.

1278487347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1264917.

The product of its digits is 2107392, while the sum is 51.

The square root of 1278487347 is about 35755.9414223706. The cubic root of 1278487347 is about 1085.3391726340.

The spelling of 1278487347 in words is "one billion, two hundred seventy-eight million, four hundred eighty-seven thousand, three hundred forty-seven".