1142220 has 24 divisors (see below), whose sum is σ = 3198384. Its totient is φ = 304576.

The previous prime is 1142201. The next prime is 1142233. The reversal of 1142220 is 222411.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1142196 and 1142205.

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 7 ways as a sum of consecutive naturals, for example, 9459 + ... + 9578.

It is an arithmetic number, because the mean of its divisors is an integer number (133266).

2^1142220 is an apocalyptic number.

1142220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1142220 is an abundant number, since it is smaller than the sum of its proper divisors (2056164).

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

1142220 is a wasteful number, since it uses less digits than its factorization.

1142220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19049 (or 19047 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 1142220 is about 1068.7469298202. The cubic root of 1142220 is about 104.5321589324.

Adding to 1142220 its reverse (222411), we get a palindrome (1364631).

The spelling of 1142220 in words is "one million, one hundred forty-two thousand, two hundred twenty".