1017720 has 96 divisors (see below), whose sum is σ = 3622320. Its totient is φ = 245760.

The previous prime is 1017719. The next prime is 1017721. The reversal of 1017720 is 277101.

It is an interprime number because it is at equal distance from previous prime (1017719) and next prime (1017721).

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

It is a junction number, because it is equal to n+sod(n) for n = 1017693 and 1017702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1017721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3832 + ... + 4088.

2^1017720 is an apocalyptic number.

1017720 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 1017720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1811160).

1017720 is an abundant number, since it is smaller than the sum of its proper divisors (2604600).

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

1017720 is a wasteful number, since it uses less digits than its factorization.

1017720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285 (or 278 counting only the distinct ones).

The product of its (nonzero) digits is 98, while the sum is 18.

The square root of 1017720 is about 1008.8210941490. The cubic root of 1017720 is about 100.5872117410.

The spelling of 1017720 in words is "one million, seventeen thousand, seven hundred twenty".