2009978 has 16 divisors (see below), whose sum is σ = 3297024. Its totient is φ = 914880.

The previous prime is 2009977. The next prime is 2009981. The reversal of 2009978 is 8799002.

It is not an unprimeable number, because it can be changed into a prime (2009971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101 + ... + 2007.

It is an arithmetic number, because the mean of its divisors is an integer number (206064).

2^2009978 is an apocalyptic number.

2009978 is a deficient number, since it is larger than the sum of its proper divisors (1287046).

2009978 is a wasteful number, since it uses less digits than its factorization.

2009978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1957.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 2009978 is about 1417.7369290528. The cubic root of 2009978 is about 126.2012823828.

The spelling of 2009978 in words is "two million, nine thousand, nine hundred seventy-eight".