1009009856 has 14 divisors (see below), whose sum is σ = 2002254060. Its totient is φ = 504504896.

The previous prime is 1009009849. The next prime is 1009009861. The reversal of 1009009856 is 6589009001.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7882826 + ... + 7882953.

Almost surely, 2^1009009856 is an apocalyptic number.

1009009856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1009009856 is a deficient number, since it is larger than the sum of its proper divisors (993244204).

1009009856 is an equidigital number, since it uses as much as digits as its factorization.

1009009856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15765791 (or 15765781 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 1009009856 is about 31764.9154886331. The cubic root of 1009009856 is about 1002.9943104891.

The spelling of 1009009856 in words is "one billion, nine million, nine thousand, eight hundred fifty-six".