2142409 has 4 divisors (see below), whose sum is σ = 2146320. Its totient is φ = 2138500.

The previous prime is 2142403. The next prime is 2142431. The reversal of 2142409 is 9042412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2142409 - 2⁵ = 2142377 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2142409.

It is not an unprimeable number, because it can be changed into a prime (2142403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 967 + ... + 2284.

It is an arithmetic number, because the mean of its divisors is an integer number (536580).

2^2142409 is an apocalyptic number.

It is an amenable number.

2142409 is a deficient number, since it is larger than the sum of its proper divisors (3911).

2142409 is an equidigital number, since it uses as much as digits as its factorization.

2142409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3910.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 2142409 is about 1463.6970314925. The cubic root of 2142409 is about 128.9142109329.

The spelling of 2142409 in words is "two million, one hundred forty-two thousand, four hundred nine".