11820042 has 24 divisors (see below), whose sum is σ = 27580644. Its totient is φ = 3636864.

The previous prime is 11820041. The next prime is 11820047. The reversal of 11820042 is 24002811.

It can be written as a sum of positive squares in 2 ways, for example, as 11758041 + 62001 = 3429^2 + 249^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 11819997 and 11820024.

It is not an unprimeable number, because it can be changed into a prime (11820041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25023 + ... + 25490.

Almost surely, 2^11820042 is an apocalyptic number.

11820042 is an abundant number, since it is smaller than the sum of its proper divisors (15760602).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11820042 is a wasteful number, since it uses less digits than its factorization.

11820042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50534 (or 50531 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 11820042 is about 3438.0287956909. The cubic root of 11820042 is about 227.7926323227.

Adding to 11820042 its reverse (24002811), we get a palindrome (35822853).

The spelling of 11820042 in words is "eleven million, eight hundred twenty thousand, forty-two".