1681794072 has 144 divisors (see below), whose sum is σ = 5318927640. Its totient is φ = 478662912.

The previous prime is 1681794067. The next prime is 1681794073. The reversal of 1681794072 is 2704971861.

It is a happy number.

It is a super-2 number, since 2×1681794072² = 5656862601228682368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681794073) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1103503 + ... + 1105025.

Almost surely, 2^1681794072 is an apocalyptic number.

1681794072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1681794072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2659463820).

1681794072 is an abundant number, since it is smaller than the sum of its proper divisors (3637133568).

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

1681794072 is a wasteful number, since it uses less digits than its factorization.

1681794072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1862 (or 1848 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The square root of 1681794072 is about 41009.6826615374. The cubic root of 1681794072 is about 1189.2074076253.

It can be divided in two parts, 16817 and 94072, that added together give a square (110889 = 333²).

The spelling of 1681794072 in words is "one billion, six hundred eighty-one million, seven hundred ninety-four thousand, seventy-two".