1681074 has 28 divisors (see below), whose sum is σ = 3783966. Its totient is φ = 559872.

The previous prime is 1681073. The next prime is 1681091. The reversal of 1681074 is 4701861.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1225449 + 455625 = 1107^2 + 675^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 882 + ... + 2034.

2^1681074 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1681074, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1891983).

1681074 is an abundant number, since it is smaller than the sum of its proper divisors (2102892).

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

1681074 is an equidigital number, since it uses as much as digits as its factorization.

1681074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1173 (or 1158 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 1681074 is about 1296.5623779826. The cubic root of 1681074 is about 118.9037660882.

The spelling of 1681074 in words is "one million, six hundred eighty-one thousand, seventy-four".