1220344542 has 56 divisors (see below), whose sum is σ = 2751212160. Its totient is φ = 405790560.

The previous prime is 1220344537. The next prime is 1220344561. The reversal of 1220344542 is 2454430221.

1220344542 is a `hidden beast` number, since 1 + 2 + 203 + 4 + 454 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 828867 + ... + 830337.

Almost surely, 2^1220344542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1220344542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1375606080).

1220344542 is an abundant number, since it is smaller than the sum of its proper divisors (1530867618).

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

1220344542 is an equidigital number, since it uses as much as digits as its factorization.

1220344542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2060 (or 2045 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

The square root of 1220344542 is about 34933.4301493569. The cubic root of 1220344542 is about 1068.6303090338.

Adding to 1220344542 its reverse (2454430221), we get a palindrome (3674774763).

The spelling of 1220344542 in words is "one billion, two hundred twenty million, three hundred forty-four thousand, five hundred forty-two".