1745820 has 96 divisors (see below), whose sum is σ = 5624640. Its totient is φ = 449280.

The previous prime is 1745813. The next prime is 1745831. The reversal of 1745820 is 285471.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28590 + ... + 28650.

It is an arithmetic number, because the mean of its divisors is an integer number (58590).

2^1745820 is an apocalyptic number.

1745820 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 1745820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2812320).

1745820 is an abundant number, since it is smaller than the sum of its proper divisors (3878820).

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

1745820 is a wasteful number, since it uses less digits than its factorization.

1745820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132 (or 124 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 1745820 is about 1321.2948194858. The cubic root of 1745820 is about 120.4110900996.

The spelling of 1745820 in words is "one million, seven hundred forty-five thousand, eight hundred twenty".