1685916842 has 8 divisors (see below), whose sum is σ = 2554946436. Its totient is φ = 834268032.

The previous prime is 1685916839. The next prime is 1685916847. The reversal of 1685916842 is 2486195861.

It can be written as a sum of positive squares in 2 ways, for example, as 1409326681 + 276590161 = 37541^2 + 16631^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1685916847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4344953 + ... + 4345340.

Almost surely, 2^1685916842 is an apocalyptic number.

1685916842 is a deficient number, since it is larger than the sum of its proper divisors (869029594).

1685916842 is an equidigital number, since it uses as much as digits as its factorization.

1685916842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8690392.

The product of its digits is 829440, while the sum is 50.

The square root of 1685916842 is about 41059.9177057139. The cubic root of 1685916842 is about 1190.1783603851.

The spelling of 1685916842 in words is "one billion, six hundred eighty-five million, nine hundred sixteen thousand, eight hundred forty-two".