1980685 has 8 divisors (see below), whose sum is σ = 2716416. Its totient is φ = 1358160.

The previous prime is 1980673. The next prime is 1980697. The reversal of 1980685 is 5860891.

It is an interprime number because it is at equal distance from previous prime (1980673) and next prime (1980697).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1980685 is a prime.

It is a super-2 number, since 2×1980685² = 7846226138450, which contains 22 as substring.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 28261 + ... + 28330.

It is an arithmetic number, because the mean of its divisors is an integer number (339552).

2^1980685 is an apocalyptic number.

It is an amenable number.

1980685 is a deficient number, since it is larger than the sum of its proper divisors (735731).

1980685 is an equidigital number, since it uses as much as digits as its factorization.

1980685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56603.

The product of its (nonzero) digits is 17280, while the sum is 37.

The square root of 1980685 is about 1407.3681110498. The cubic root of 1980685 is about 125.5852026937.

It can be divided in two parts, 19806 and 85, that added together give a palindrome (19891).

The spelling of 1980685 in words is "one million, nine hundred eighty thousand, six hundred eighty-five".