1621473984 has 448 divisors, whose sum is σ = 5632704000. Its totient is φ = 452874240.

The previous prime is 1621473983. The next prime is 1621474007. The reversal of 1621473984 is 4893741261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621473983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12377599 + ... + 12377729.

It is an arithmetic number, because the mean of its divisors is an integer number (12573000).

Almost surely, 2^1621473984 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1621473984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2816352000).

1621473984 is an abundant number, since it is smaller than the sum of its proper divisors (4011230016).

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

1621473984 is a wasteful number, since it uses less digits than its factorization.

1621473984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213 (or 197 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 1621473984 is about 40267.5301452672. The cubic root of 1621473984 is about 1174.8163851306.

The spelling of 1621473984 in words is "one billion, six hundred twenty-one million, four hundred seventy-three thousand, nine hundred eighty-four".