1920685 has 12 divisors (see below), whose sum is σ = 2496852. Its totient is φ = 1417728.

The previous prime is 1920683. The next prime is 1920701. The reversal of 1920685 is 5860291.

It can be written as a sum of positive squares in 6 ways, for example, as 106276 + 1814409 = 326^2 + 1347^2 .

It is not a de Polignac number, because 1920685 - 2¹ = 1920683 is a prime.

It is a Duffinian number.

1920685 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1920683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 292 + ... + 1981.

It is an arithmetic number, because the mean of its divisors is an integer number (208071).

2^1920685 is an apocalyptic number.

It is an amenable number.

1920685 is a deficient number, since it is larger than the sum of its proper divisors (576167).

1920685 is a wasteful number, since it uses less digits than its factorization.

1920685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2304 (or 2291 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 1920685 is about 1385.8878020965. The cubic root of 1920685 is about 124.3040794131.

It can be divided in two parts, 19206 and 85, that added together give a palindrome (19291).

The spelling of 1920685 in words is "one million, nine hundred twenty thousand, six hundred eighty-five".