1683396985 has 4 divisors (see below), whose sum is σ = 2020076388. Its totient is φ = 1346717584.

The previous prime is 1683396977. The next prime is 1683396989. The reversal of 1683396985 is 5896933861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 244484496 + 1438912489 = 15636^2 + 37933^2 .

It is a cyclic number.

It is not a de Polignac number, because 1683396985 - 2³ = 1683396977 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1683396989) 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, 168339694 + ... + 168339703.

It is an arithmetic number, because the mean of its divisors is an integer number (505019097).

Almost surely, 2^1683396985 is an apocalyptic number.

It is an amenable number.

1683396985 is a deficient number, since it is larger than the sum of its proper divisors (336679403).

1683396985 is an equidigital number, since it uses as much as digits as its factorization.

1683396985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336679402.

The product of its digits is 8398080, while the sum is 58.

The square root of 1683396985 is about 41029.2211113007. The cubic root of 1683396985 is about 1189.5850976903.

The spelling of 1683396985 in words is "one billion, six hundred eighty-three million, three hundred ninety-six thousand, nine hundred eighty-five".