1263881906 has 16 divisors (see below), whose sum is σ = 2172801024. Its totient is φ = 540127104.

The previous prime is 1263881887. The next prime is 1263881911. The reversal of 1263881906 is 6091883621.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122930 + ... + 132813.

It is an arithmetic number, because the mean of its divisors is an integer number (135800064).

Almost surely, 2^1263881906 is an apocalyptic number.

1263881906 is a deficient number, since it is larger than the sum of its proper divisors (908919118).

1263881906 is a wasteful number, since it uses less digits than its factorization.

1263881906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256105.

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 1263881906 is about 35551.1168038361. The cubic root of 1263881906 is about 1081.1903616142.

The spelling of 1263881906 in words is "one billion, two hundred sixty-three million, eight hundred eighty-one thousand, nine hundred six".