1220417440 has 96 divisors (see below), whose sum is σ = 3253944960. Its totient is φ = 428467200.

The previous prime is 1220417417. The next prime is 1220417447. The reversal of 1220417440 is 447140221.

It is not an unprimeable number, because it can be changed into a prime (1220417447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39085 + ... + 62995.

It is an arithmetic number, because the mean of its divisors is an integer number (33895260).

Almost surely, 2^1220417440 is an apocalyptic number.

1220417440 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 1220417440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1626972480).

1220417440 is an abundant number, since it is smaller than the sum of its proper divisors (2033527520).

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

1220417440 is a wasteful number, since it uses less digits than its factorization.

1220417440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23966 (or 23958 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 1220417440 is about 34934.4735182885. The cubic root of 1220417440 is about 1068.6515870304.

Adding to 1220417440 its reverse (447140221), we get a palindrome (1667557661).

The spelling of 1220417440 in words is "one billion, two hundred twenty million, four hundred seventeen thousand, four hundred forty".