1644960 has 96 divisors (see below), whose sum is σ = 5443200. Its totient is φ = 416768.

The previous prime is 1644949. The next prime is 1644989. The reversal of 1644960 is 694461.

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 (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10966 + ... + 11114.

It is an arithmetic number, because the mean of its divisors is an integer number (56700).

2^1644960 is an apocalyptic number.

1644960 is a gapful number since it is divisible by the number (10) 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 1644960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2721600).

1644960 is an abundant number, since it is smaller than the sum of its proper divisors (3798240).

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

1644960 is a wasteful number, since it uses less digits than its factorization.

1644960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190 (or 182 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 1644960 is about 1282.5599401198. The cubic root of 1644960 is about 118.0461372776.

The spelling of 1644960 in words is "one million, six hundred forty-four thousand, nine hundred sixty".