1267978463 has 4 divisors (see below), whose sum is σ = 1268539560. Its totient is φ = 1267417368.

The previous prime is 1267978447. The next prime is 1267978469. The reversal of 1267978463 is 3648797621.

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

It is a cyclic number.

It is not a de Polignac number, because 1267978463 - 2⁴ = 1267978447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1267978469) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 277145 + ... + 281682.

It is an arithmetic number, because the mean of its divisors is an integer number (317134890).

Almost surely, 2^1267978463 is an apocalyptic number.

1267978463 is a deficient number, since it is larger than the sum of its proper divisors (561097).

1267978463 is an equidigital number, since it uses as much as digits as its factorization.

1267978463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561096.

The product of its digits is 3048192, while the sum is 53.

The square root of 1267978463 is about 35608.6852186373. The cubic root of 1267978463 is about 1082.3572378299.

The spelling of 1267978463 in words is "one billion, two hundred sixty-seven million, nine hundred seventy-eight thousand, four hundred sixty-three".