1278140674 has 4 divisors (see below), whose sum is σ = 1917211014. Its totient is φ = 639070336.

The previous prime is 1278140671. The next prime is 1278140707. The reversal of 1278140674 is 4760418721.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 1264869225 + 13271449 = 35565^2 + 3643^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1278140671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319535167 + ... + 319535170.

Almost surely, 2^1278140674 is an apocalyptic number.

1278140674 is a deficient number, since it is larger than the sum of its proper divisors (639070340).

1278140674 is an equidigital number, since it uses as much as digits as its factorization.

1278140674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639070339.

The product of its (nonzero) digits is 75264, while the sum is 40.

The square root of 1278140674 is about 35751.0933259390. The cubic root of 1278140674 is about 1085.2410640367.

The spelling of 1278140674 in words is "one billion, two hundred seventy-eight million, one hundred forty thousand, six hundred seventy-four".