1591984 has 40 divisors (see below), whose sum is σ = 3303360. Its totient is φ = 741888.

The previous prime is 1591981. The next prime is 1592027. The reversal of 1591984 is 4891951.

It is not an unprimeable number, because it can be changed into a prime (1591981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21772 + ... + 21844.

It is an arithmetic number, because the mean of its divisors is an integer number (82584).

2^1591984 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 1591984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1651680).

1591984 is an abundant number, since it is smaller than the sum of its proper divisors (1711376).

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

1591984 is a wasteful number, since it uses less digits than its factorization.

1591984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157 (or 151 counting only the distinct ones).

The product of its digits is 12960, while the sum is 37.

The square root of 1591984 is about 1261.7384832048. The cubic root of 1591984 is about 116.7650580409.

The spelling of 1591984 in words is "one million, five hundred ninety-one thousand, nine hundred eighty-four".