1881984 has 96 divisors (see below), whose sum is σ = 5599800. Its totient is φ = 559104.

The previous prime is 1881983. The next prime is 1881989. The reversal of 1881984 is 4891881.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (39).

Its product of digits (18432) is a multiple of the sum of its prime factors (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1881983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64882 + ... + 64910.

2^1881984 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 1881984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2799900).

1881984 is an abundant number, since it is smaller than the sum of its proper divisors (3717816).

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

1881984 is a wasteful number, since it uses less digits than its factorization.

1881984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72 (or 47 counting only the distinct ones).

The product of its digits is 18432, while the sum is 39.

The square root of 1881984 is about 1371.8542196604. The cubic root of 1881984 is about 123.4635164625.

The spelling of 1881984 in words is "one million, eight hundred eighty-one thousand, nine hundred eighty-four".