1220335140 has 96 divisors (see below), whose sum is σ = 3637267200. Its totient is φ = 304644096.

The previous prime is 1220335093. The next prime is 1220335153. The reversal of 1220335140 is 415330221.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 193761 + ... + 199959.

It is an arithmetic number, because the mean of its divisors is an integer number (37888200).

Almost surely, 2^1220335140 is an apocalyptic number.

1220335140 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 1220335140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1818633600).

1220335140 is an abundant number, since it is smaller than the sum of its proper divisors (2416932060).

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

1220335140 is a wasteful number, since it uses less digits than its factorization.

1220335140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6421 (or 6419 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 1220335140 is about 34933.2955788600. The cubic root of 1220335140 is about 1068.6275646482.

Adding to 1220335140 its reverse (415330221), we get a palindrome (1635665361).

The spelling of 1220335140 in words is "one billion, two hundred twenty million, three hundred thirty-five thousand, one hundred forty".