1221487484 has 48 divisors (see below), whose sum is σ = 2503468800. Its totient is φ = 521262000.

The previous prime is 1221487481. The next prime is 1221487489. The reversal of 1221487484 is 4847841221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221487481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 342599 + ... + 346145.

It is an arithmetic number, because the mean of its divisors is an integer number (52155600).

Almost surely, 2^1221487484 is an apocalyptic number.

1221487484 is a gapful number since it is divisible by the number (14) 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 1221487484, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1251734400).

1221487484 is an abundant number, since it is smaller than the sum of its proper divisors (1281981316).

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

1221487484 is a wasteful number, since it uses less digits than its factorization.

1221487484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3823 (or 3807 counting only the distinct ones).

The product of its digits is 114688, while the sum is 41.

The square root of 1221487484 is about 34949.7851781667. The cubic root of 1221487484 is about 1068.9638217739.

The spelling of 1221487484 in words is "one billion, two hundred twenty-one million, four hundred eighty-seven thousand, four hundred eighty-four".