1971648 has 112 divisors (see below), whose sum is σ = 6664960. Its totient is φ = 559872.

The previous prime is 1971647. The next prime is 1971659. The reversal of 1971648 is 8461791.

1971648 is a `hidden beast` number, since 1 + 9 + 7 + 1 + 648 = 666.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1971647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12015 + ... + 12177.

2^1971648 is an apocalyptic number.

1971648 is a gapful number since it is divisible by the number (18) 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 1971648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3332480).

1971648 is an abundant number, since it is smaller than the sum of its proper divisors (4693312).

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

1971648 is a wasteful number, since it uses less digits than its factorization.

1971648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191 (or 175 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 1971648 is about 1404.1538377258. The cubic root of 1971648 is about 125.3939146792.

The spelling of 1971648 in words is "one million, nine hundred seventy-one thousand, six hundred forty-eight".