1247618220 has 24 divisors (see below), whose sum is σ = 3493331184. Its totient is φ = 332698176.

The previous prime is 1247618213. The next prime is 1247618227. The reversal of 1247618220 is 228167421.

It is an interprime number because it is at equal distance from previous prime (1247618213) and next prime (1247618227).

It is not an unprimeable number, because it can be changed into a prime (1247618227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10396759 + ... + 10396878.

It is an arithmetic number, because the mean of its divisors is an integer number (145555466).

Almost surely, 2^1247618220 is an apocalyptic number.

1247618220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1247618220 is an abundant number, since it is smaller than the sum of its proper divisors (2245712964).

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

1247618220 is a wasteful number, since it uses less digits than its factorization.

1247618220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20793649 (or 20793647 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 1247618220 is about 35321.6395429204. The cubic root of 1247618220 is about 1076.5327247402.

The spelling of 1247618220 in words is "one billion, two hundred forty-seven million, six hundred eighteen thousand, two hundred twenty".