1679720 has 48 divisors (see below), whose sum is σ = 4401540. Its totient is φ = 575232.

The previous prime is 1679701. The next prime is 1679723. The reversal of 1679720 is 279761.

It can be written as a sum of positive squares in 2 ways, for example, as 1623076 + 56644 = 1274^2 + 238^2 .

It is a d-powerful number, because it can be written as 1 + 6⁸ + 7 + 9² + 7 + 2³ + 0 .

It is not an unprimeable number, because it can be changed into a prime (1679723) 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, 1532 + ... + 2388.

2^1679720 is an apocalyptic number.

1679720 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 1679720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2200770).

1679720 is an abundant number, since it is smaller than the sum of its proper divisors (2721820).

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

1679720 is a wasteful number, since it uses less digits than its factorization.

1679720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 882 (or 871 counting only the distinct ones).

The product of its (nonzero) digits is 5292, while the sum is 32.

The square root of 1679720 is about 1296.0401228357. The cubic root of 1679720 is about 118.8718343306.

The spelling of 1679720 in words is "one million, six hundred seventy-nine thousand, seven hundred twenty".