1242209 has 4 divisors (see below), whose sum is σ = 1253316. Its totient is φ = 1231104.

The previous prime is 1242193. The next prime is 1242217. The reversal of 1242209 is 9022421.

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 93025 + 1149184 = 305^2 + 1072^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242209 - 2⁴ = 1242193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242289) 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, 5384 + ... + 5609.

It is an arithmetic number, because the mean of its divisors is an integer number (313329).

2^1242209 is an apocalyptic number.

It is an amenable number.

1242209 is a deficient number, since it is larger than the sum of its proper divisors (11107).

1242209 is a wasteful number, since it uses less digits than its factorization.

1242209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11106.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 1242209 is about 1114.5443014973. The cubic root of 1242209 is about 107.4974652368.

The spelling of 1242209 in words is "one million, two hundred forty-two thousand, two hundred nine".