1681573794 has 8 divisors (see below), whose sum is σ = 3363147600. Its totient is φ = 560524596.

The previous prime is 1681573753. The next prime is 1681573799. The reversal of 1681573794 is 4973751861.

It is a happy number.

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

1681573794 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1681573799) 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, 140131144 + ... + 140131155.

It is an arithmetic number, because the mean of its divisors is an integer number (420393450).

Almost surely, 2^1681573794 is an apocalyptic number.

1681573794 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1681573794 is a wasteful number, since it uses less digits than its factorization.

1681573794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280262304.

The product of its digits is 1270080, while the sum is 51.

The square root of 1681573794 is about 41006.9968907746. The cubic root of 1681573794 is about 1189.1554853613.

It can be divided in two parts, 16815 and 73794, that added together give a palindrome (90609).

The spelling of 1681573794 in words is "one billion, six hundred eighty-one million, five hundred seventy-three thousand, seven hundred ninety-four".