1685323240 has 24 divisors (see below), whose sum is σ = 3792561570. Its totient is φ = 674025440.

The previous prime is 1685323223. The next prime is 1685323247. The reversal of 1685323240 is 423235861.

It can be written as a sum of positive squares in only one way, i.e., 1516790916 + 168532324 = 38946^2 + 12982^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1685323196 and 1685323205.

It is not an unprimeable number, because it can be changed into a prime (1685323247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 256395 + ... + 262885.

Almost surely, 2^1685323240 is an apocalyptic number.

1685323240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1685323240 is an abundant number, since it is smaller than the sum of its proper divisors (2107238330).

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

1685323240 is an frugal number, since it uses more digits than its factorization.

1685323240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12993 (or 6498 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 1685323240 is about 41052.6885843059. The cubic root of 1685323240 is about 1190.0386589140.

The spelling of 1685323240 in words is "one billion, six hundred eighty-five million, three hundred twenty-three thousand, two hundred forty".