1640168 has 16 divisors (see below), whose sum is σ = 3126660. Its totient is φ = 806400.

The previous prime is 1640167. The next prime is 1640183. The reversal of 1640168 is 8610461.

It can be written as a sum of positive squares in 2 ways, for example, as 1592644 + 47524 = 1262^2 + 218^2 .

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1640167) 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, 1193 + ... + 2168.

2^1640168 is an apocalyptic number.

It is an amenable number.

1640168 is a deficient number, since it is larger than the sum of its proper divisors (1486492).

1640168 is a wasteful number, since it uses less digits than its factorization.

1640168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3428 (or 3424 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 1640168 is about 1280.6904387868. The cubic root of 1640168 is about 117.9313974502.

The spelling of 1640168 in words is "one million, six hundred forty thousand, one hundred sixty-eight".