1378644314 has 4 divisors (see below), whose sum is σ = 2067966474. Its totient is φ = 689322156.

The previous prime is 1378644301. The next prime is 1378644329. The reversal of 1378644314 is 4134468731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4134468731 = 17 ⋅243204043.

It can be written as a sum of positive squares in only one way, i.e., 1263447025 + 115197289 = 35545^2 + 10733^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344661077 + ... + 344661080.

Almost surely, 2^1378644314 is an apocalyptic number.

1378644314 is a deficient number, since it is larger than the sum of its proper divisors (689322160).

1378644314 is an equidigital number, since it uses as much as digits as its factorization.

1378644314 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689322159.

The product of its digits is 193536, while the sum is 41.

The square root of 1378644314 is about 37130.0998382714. The cubic root of 1378644314 is about 1112.9715885433.

The spelling of 1378644314 in words is "one billion, three hundred seventy-eight million, six hundred forty-four thousand, three hundred fourteen".