1984121544 has 128 divisors (see below), whose sum is σ = 5419560960. Its totient is φ = 602907648.

The previous prime is 1984121533. The next prime is 1984121549. The reversal of 1984121544 is 4451214891.

It is not an unprimeable number, because it can be changed into a prime (1984121549) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2051349 + ... + 2052315.

It is an arithmetic number, because the mean of its divisors is an integer number (42340320).

Almost surely, 2^1984121544 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 1984121544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2709780480).

1984121544 is an abundant number, since it is smaller than the sum of its proper divisors (3435439416).

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

1984121544 is a wasteful number, since it uses less digits than its factorization.

1984121544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1147 (or 1143 counting only the distinct ones).

The product of its digits is 46080, while the sum is 39.

The square root of 1984121544 is about 44543.4792534216. The cubic root of 1984121544 is about 1256.5779201080.

The spelling of 1984121544 in words is "one billion, nine hundred eighty-four million, one hundred twenty-one thousand, five hundred forty-four".