2140509 has 8 divisors (see below), whose sum is σ = 3261760. Its totient is φ = 1223136.

The previous prime is 2140477. The next prime is 2140513. The reversal of 2140509 is 9050412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2140509 - 2⁵ = 2140477 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 101929 = 2140509 / (2 + 1 + 4 + 0 + 5 + 0 + 9).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2140549) 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, 50944 + ... + 50985.

It is an arithmetic number, because the mean of its divisors is an integer number (407720).

2^2140509 is an apocalyptic number.

It is an amenable number.

2140509 is a deficient number, since it is larger than the sum of its proper divisors (1121251).

2140509 is a wasteful number, since it uses less digits than its factorization.

2140509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101939.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 2140509 is about 1463.0478461076. The cubic root of 2140509 is about 128.8760903804.

Subtracting 2140509 from its reverse (9050412), we obtain a triangular number (6909903 = T₃₇₁₇).

The spelling of 2140509 in words is "two million, one hundred forty thousand, five hundred nine".