2140809 has 16 divisors (see below), whose sum is σ = 3222720. Its totient is φ = 1252160.

The previous prime is 2140807. The next prime is 2140811. The reversal of 2140809 is 9080412.

It is an interprime number because it is at equal distance from previous prime (2140807) and next prime (2140811).

It is a cyclic number.

It is not a de Polignac number, because 2140809 - 2¹ = 2140807 is a prime.

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2140807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 162 + ... + 2075.

It is an arithmetic number, because the mean of its divisors is an integer number (201420).

2^2140809 is an apocalyptic number.

2140809 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

2140809 is a deficient number, since it is larger than the sum of its proper divisors (1081911).

2140809 is a wasteful number, since it uses less digits than its factorization.

2140809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2280.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 2140809 is about 1463.1503682124. The cubic root of 2140809 is about 128.8821109143.

The spelling of 2140809 in words is "two million, one hundred forty thousand, eight hundred nine".