2009640 has 32 divisors (see below), whose sum is σ = 6029280. Its totient is φ = 535872.

The previous prime is 2009639. The next prime is 2009647. The reversal of 2009640 is 469002.

It is not an unprimeable number, because it can be changed into a prime (2009647) 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, 8254 + ... + 8493.

It is an arithmetic number, because the mean of its divisors is an integer number (188415).

2^2009640 is an apocalyptic number.

2009640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2009640 is an abundant number, since it is smaller than the sum of its proper divisors (4019640).

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

2009640 is a wasteful number, since it uses less digits than its factorization.

2009640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16761 (or 16757 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 2009640 is about 1417.6177199795. The cubic root of 2009640 is about 126.1942079397.

The spelling of 2009640 in words is "two million, nine thousand, six hundred forty".