1221472980 has 576 divisors, whose sum is σ = 4922830080. Its totient is φ = 249080832.

The previous prime is 1221472963. The next prime is 1221472991. The reversal of 1221472980 is 892741221.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 18230907 + ... + 18230973.

It is an arithmetic number, because the mean of its divisors is an integer number (8546580).

Almost surely, 2^1221472980 is an apocalyptic number.

1221472980 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 1221472980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2461415040).

1221472980 is an abundant number, since it is smaller than the sum of its proper divisors (3701357100).

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

1221472980 is a wasteful number, since it uses less digits than its factorization.

1221472980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165 (or 150 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 1221472980 is about 34949.5776798519. The cubic root of 1221472980 is about 1068.9595907815.

The spelling of 1221472980 in words is "one billion, two hundred twenty-one million, four hundred seventy-two thousand, nine hundred eighty".