1209142 has 32 divisors (see below), whose sum is σ = 2169504. Its totient is φ = 499200.

The previous prime is 1209139. The next prime is 1209151. The reversal of 1209142 is 2419021.

It is a plaindrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19792 + ... + 19852.

It is an arithmetic number, because the mean of its divisors is an integer number (67797).

2^1209142 is an apocalyptic number.

1209142 is a deficient number, since it is larger than the sum of its proper divisors (960362).

1209142 is a wasteful number, since it uses less digits than its factorization.

1209142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144.

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

The square root of 1209142 is about 1099.6099308391. The cubic root of 1209142 is about 106.5350307591.

The spelling of 1209142 in words is "one million, two hundred nine thousand, one hundred forty-two".