1242109 has 4 divisors (see below), whose sum is σ = 1355040. Its totient is φ = 1129180.

The previous prime is 1242107. The next prime is 1242119. The reversal of 1242109 is 9012421.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9012421 = 11 ⋅819311.

It is a cyclic number.

It is not a de Polignac number, because 1242109 - 2¹ = 1242107 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242103) 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, 56449 + ... + 56470.

It is an arithmetic number, because the mean of its divisors is an integer number (338760).

2^1242109 is an apocalyptic number.

It is an amenable number.

1242109 is a deficient number, since it is larger than the sum of its proper divisors (112931).

1242109 is a wasteful number, since it uses less digits than its factorization.

1242109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112930.

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

The square root of 1242109 is about 1114.4994392103. The cubic root of 1242109 is about 107.4945805813.

The spelling of 1242109 in words is "one million, two hundred forty-two thousand, one hundred nine".