1220045140 has 24 divisors (see below), whose sum is σ = 2604098952. Its totient is φ = 480017280.

The previous prime is 1220045089. The next prime is 1220045173. The reversal of 1220045140 is 415400221.

It can be written as a sum of positive squares in 4 ways, for example, as 91891396 + 1128153744 = 9586^2 + 33588^2 .

1220045140 is a modest number, since divided by 45140 gives 1220 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 498799 + ... + 501238.

It is an arithmetic number, because the mean of its divisors is an integer number (108504123).

Almost surely, 2^1220045140 is an apocalyptic number.

1220045140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220045140 is an abundant number, since it is smaller than the sum of its proper divisors (1384053812).

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

1220045140 is a wasteful number, since it uses less digits than its factorization.

1220045140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000107 (or 1000105 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 1220045140 is about 34929.1445643892. The cubic root of 1220045140 is about 1068.5429085197.

Adding to 1220045140 its reverse (415400221), we get a palindrome (1635445361).

The spelling of 1220045140 in words is "one billion, two hundred twenty million, forty-five thousand, one hundred forty".