1009506978 has 24 divisors (see below), whose sum is σ = 2195346816. Its totient is φ = 335259000.

The previous prime is 1009506977. The next prime is 1009506991. The reversal of 1009506978 is 8796059001.

It is not an unprimeable number, because it can be changed into a prime (1009506973) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 98598 + ... + 108353.

It is an arithmetic number, because the mean of its divisors is an integer number (91472784).

Almost surely, 2^1009506978 is an apocalyptic number.

1009506978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1009506978 is an abundant number, since it is smaller than the sum of its proper divisors (1185839838).

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

1009506978 is a wasteful number, since it uses less digits than its factorization.

1009506978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207230 (or 207227 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 1009506978 is about 31772.7395419407. The cubic root of 1009506978 is about 1003.1590028594.

The spelling of 1009506978 in words is "one billion, nine million, five hundred six thousand, nine hundred seventy-eight".