1211842 has 4 divisors (see below), whose sum is σ = 1817766. Its totient is φ = 605920.

The previous prime is 1211827. The next prime is 1211843. The reversal of 1211842 is 2481121.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 1185921 + 25921 = 1089^2 + 161^2 .

It is a super-2 number, since 2×1211842² = 2937122065928, which contains 22 as substring.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211843) by changing a digit.

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 as a sum of consecutive naturals, namely, 302959 + ... + 302962.

2^1211842 is an apocalyptic number.

1211842 is a deficient number, since it is larger than the sum of its proper divisors (605924).

1211842 is an equidigital number, since it uses as much as digits as its factorization.

1211842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605923.

The product of its digits is 128, while the sum is 19.

The square root of 1211842 is about 1100.8369543216. The cubic root of 1211842 is about 106.6142689698.

Adding to 1211842 its reverse (2481121), we get a palindrome (3692963).

The spelling of 1211842 in words is "one million, two hundred eleven thousand, eight hundred forty-two".