1273981378 has 8 divisors (see below), whose sum is σ = 1911304080. Its totient is φ = 636880020.

The previous prime is 1273981361. The next prime is 1273981393. The reversal of 1273981378 is 8731893721.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40108 + ... + 64471.

It is an arithmetic number, because the mean of its divisors is an integer number (238913010).

Almost surely, 2^1273981378 is an apocalyptic number.

1273981378 is a deficient number, since it is larger than the sum of its proper divisors (637322702).

1273981378 is a wasteful number, since it uses less digits than its factorization.

1273981378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110672.

The product of its digits is 508032, while the sum is 49.

The square root of 1273981378 is about 35692.8757317199. The cubic root of 1273981378 is about 1084.0625959550.

The spelling of 1273981378 in words is "one billion, two hundred seventy-three million, nine hundred eighty-one thousand, three hundred seventy-eight".