1220937500 has 48 divisors (see below), whose sum is σ = 2671477536. Its totient is φ = 488250000.

The previous prime is 1220937481. The next prime is 1220937503. The reversal of 1220937500 is 57390221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220937503) 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, 310547 + ... + 314453.

It is an arithmetic number, because the mean of its divisors is an integer number (55655782).

Almost surely, 2^1220937500 is an apocalyptic number.

1220937500 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 1220937500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1335738768).

1220937500 is an abundant number, since it is smaller than the sum of its proper divisors (1450540036).

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

1220937500 is an frugal number, since it uses more digits than its factorization.

1220937500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3946 (or 3914 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 1220937500 is about 34941.9160894190. The cubic root of 1220937500 is about 1068.8033613337.

The spelling of 1220937500 in words is "one billion, two hundred twenty million, nine hundred thirty-seven thousand, five hundred".