1721964 has 48 divisors (see below), whose sum is σ = 4451328. Its totient is φ = 515328.

The previous prime is 1721927. The next prime is 1721983. The reversal of 1721964 is 4691271.

It is a happy 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, 4509 + ... + 4875.

It is an arithmetic number, because the mean of its divisors is an integer number (92736).

2^1721964 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 1721964, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2225664).

1721964 is an abundant number, since it is smaller than the sum of its proper divisors (2729364).

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

1721964 is a wasteful number, since it uses less digits than its factorization.

1721964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414 (or 412 counting only the distinct ones).

The product of its digits is 3024, while the sum is 30.

The square root of 1721964 is about 1312.2362592155. The cubic root of 1721964 is about 119.8601147755.

The spelling of 1721964 in words is "one million, seven hundred twenty-one thousand, nine hundred sixty-four".