11420209 has 4 divisors (see below), whose sum is σ = 12092004. Its totient is φ = 10748416.

The previous prime is 11420203. The next prime is 11420239. The reversal of 11420209 is 90202411.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8392609 + 3027600 = 2897^2 + 1740^2 .

It is a cyclic number.

It is not a de Polignac number, because 11420209 - 2⁵ = 11420177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11420203) 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, 335872 + ... + 335905.

It is an arithmetic number, because the mean of its divisors is an integer number (3023001).

Almost surely, 2^11420209 is an apocalyptic number.

It is an amenable number.

11420209 is a deficient number, since it is larger than the sum of its proper divisors (671795).

11420209 is an equidigital number, since it uses as much as digits as its factorization.

11420209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671794.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 11420209 is about 3379.3799727169. The cubic root of 11420209 is about 225.1946233732.

The spelling of 11420209 in words is "eleven million, four hundred twenty thousand, two hundred nine".