1681268 has 6 divisors (see below), whose sum is σ = 2942226. Its totient is φ = 840632.

The previous prime is 1681261. The next prime is 1681271. The reversal of 1681268 is 8621861.

It can be written as a sum of positive squares in only one way, i.e., 1106704 + 574564 = 1052^2 + 758^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210155 + ... + 210162.

It is an arithmetic number, because the mean of its divisors is an integer number (490371).

2^1681268 is an apocalyptic number.

It is an amenable number.

1681268 is a deficient number, since it is larger than the sum of its proper divisors (1260958).

1681268 is a wasteful number, since it uses less digits than its factorization.

1681268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420321 (or 420319 counting only the distinct ones).

The product of its digits is 4608, while the sum is 32.

The square root of 1681268 is about 1296.6371890394. The cubic root of 1681268 is about 118.9083398396.

The spelling of 1681268 in words is "one million, six hundred eighty-one thousand, two hundred sixty-eight".