1720116 has 30 divisors (see below), whose sum is σ = 4497570. Its totient is φ = 573264.

The previous prime is 1720109. The next prime is 1720123. The reversal of 1720116 is 6110271.

It is an interprime number because it is at equal distance from previous prime (1720109) and next prime (1720123).

It can be written as a sum of positive squares in only one way, i.e., 910116 + 810000 = 954^2 + 900^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2331 + ... + 2978.

It is an arithmetic number, because the mean of its divisors is an integer number (149919).

2^1720116 is an apocalyptic number.

It is an amenable number.

1720116 is an abundant number, since it is smaller than the sum of its proper divisors (2777454).

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

1720116 is a wasteful number, since it uses less digits than its factorization.

1720116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5325 (or 5314 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 18.

The square root of 1720116 is about 1311.5319287002. The cubic root of 1720116 is about 119.8172217423.

Adding to 1720116 its reverse (6110271), we get a palindrome (7830387).

The spelling of 1720116 in words is "one million, seven hundred twenty thousand, one hundred sixteen".