1686964 has 6 divisors (see below), whose sum is σ = 2952194. Its totient is φ = 843480.

The previous prime is 1686943. The next prime is 1686967. The reversal of 1686964 is 4696861.

It can be written as a sum of positive squares in only one way, i.e., 1542564 + 144400 = 1242^2 + 380^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1686967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210867 + ... + 210874.

2^1686964 is an apocalyptic number.

It is an amenable number.

1686964 is a deficient number, since it is larger than the sum of its proper divisors (1265230).

1686964 is a wasteful number, since it uses less digits than its factorization.

1686964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421745 (or 421743 counting only the distinct ones).

The product of its digits is 62208, while the sum is 40.

The square root of 1686964 is about 1298.8317827956. The cubic root of 1686964 is about 119.0424724226.

The spelling of 1686964 in words is "one million, six hundred eighty-six thousand, nine hundred sixty-four".