1640164 has 24 divisors (see below), whose sum is σ = 3002328. Its totient is φ = 783360.

The previous prime is 1640147. The next prime is 1640167. The reversal of 1640164 is 4610461.

It can be written as a sum of positive squares in 4 ways, for example, as 57600 + 1582564 = 240^2 + 1258^2 .

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 11904 + ... + 12040.

It is an arithmetic number, because the mean of its divisors is an integer number (125097).

2^1640164 is an apocalyptic number.

It is an amenable number.

1640164 is a deficient number, since it is larger than the sum of its proper divisors (1362164).

1640164 is a wasteful number, since it uses less digits than its factorization.

1640164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255 (or 253 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 1640164 is about 1280.6888771282. The cubic root of 1640164 is about 117.9313015807.

The spelling of 1640164 in words is "one million, six hundred forty thousand, one hundred sixty-four".