2029840 has 20 divisors (see below), whose sum is σ = 4719564. Its totient is φ = 811904.

The previous prime is 2029831. The next prime is 2029843. The reversal of 2029840 is 489202.

It can be written as a sum of positive squares in 2 ways, for example, as 266256 + 1763584 = 516^2 + 1328^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (2029843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12607 + ... + 12766.

2^2029840 is an apocalyptic number.

2029840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2029840 is an abundant number, since it is smaller than the sum of its proper divisors (2689724).

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

2029840 is a wasteful number, since it uses less digits than its factorization.

2029840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25386 (or 25380 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 2029840 is about 1424.7245347786. The cubic root of 2029840 is about 126.6156150071.

The spelling of 2029840 in words is "two million, twenty-nine thousand, eight hundred forty".