1220503140 has 120 divisors (see below), whose sum is σ = 3837601152. Its totient is φ = 324717120.

The previous prime is 1220503121. The next prime is 1220503157. The reversal of 1220503140 is 413050221.

1220503140 is a `hidden beast` number, since 1 + 2 + 20 + 503 + 140 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1339285 + ... + 1340195.

Almost surely, 2^1220503140 is an apocalyptic number.

1220503140 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 1220503140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1918800576).

1220503140 is an abundant number, since it is smaller than the sum of its proper divisors (2617098012).

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

1220503140 is a wasteful number, since it uses less digits than its factorization.

1220503140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1759 (or 1748 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 1220503140 is about 34935.7000788592. The cubic root of 1220503140 is about 1068.6766006841.

Adding to 1220503140 its reverse (413050221), we get a palindrome (1633553361).

The spelling of 1220503140 in words is "one billion, two hundred twenty million, five hundred three thousand, one hundred forty".