1263486378 has 32 divisors (see below), whose sum is σ = 3150512640. Its totient is φ = 328178160.

The previous prime is 1263486331. The next prime is 1263486443. The reversal of 1263486378 is 8736843621.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1366948 + ... + 1367871.

It is an arithmetic number, because the mean of its divisors is an integer number (98453520).

Almost surely, 2^1263486378 is an apocalyptic number.

1263486378 is an abundant number, since it is smaller than the sum of its proper divisors (1887026262).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1263486378 is a wasteful number, since it uses less digits than its factorization.

1263486378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2734842.

The product of its digits is 1161216, while the sum is 48.

The square root of 1263486378 is about 35545.5535615919. The cubic root of 1263486378 is about 1081.0775647680.

The spelling of 1263486378 in words is "one billion, two hundred sixty-three million, four hundred eighty-six thousand, three hundred seventy-eight".