1242220 has 48 divisors (see below), whose sum is σ = 3144960. Its totient is φ = 402624.

The previous prime is 1242217. The next prime is 1242221. The reversal of 1242220 is 222421.

1242220 = T₄₄₉ + T₄₅₀ + ... + T₄₆₀.

It is a super-2 number, since 2×1242220² = 3086221056800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1242220.

It is not an unprimeable number, because it can be changed into a prime (1242221) 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 in 15 ways as a sum of consecutive naturals, for example, 2427 + ... + 2893.

It is an arithmetic number, because the mean of its divisors is an integer number (65520).

2^1242220 is an apocalyptic number.

1242220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1242220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1572480).

1242220 is an abundant number, since it is smaller than the sum of its proper divisors (1902740).

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

1242220 is a wasteful number, since it uses less digits than its factorization.

1242220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502 (or 500 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 1242220 is about 1114.5492362386. The cubic root of 1242220 is about 107.4977825394.

Adding to 1242220 its reverse (222421), we get a palindrome (1464641).

The spelling of 1242220 in words is "one million, two hundred forty-two thousand, two hundred twenty".