1640504 has 8 divisors (see below), whose sum is σ = 3075960. Its totient is φ = 820248.

The previous prime is 1640503. The next prime is 1640519. The reversal of 1640504 is 4050461.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102524 + ... + 102539.

It is an arithmetic number, because the mean of its divisors is an integer number (384495).

2^1640504 is an apocalyptic number.

It is an amenable number.

1640504 is a deficient number, since it is larger than the sum of its proper divisors (1435456).

1640504 is a wasteful number, since it uses less digits than its factorization.

1640504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205069 (or 205065 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1640504 is about 1280.8216113105. The cubic root of 1640504 is about 117.9394499269.

Adding to 1640504 its reverse (4050461), we get a palindrome (5690965).

The spelling of 1640504 in words is "one million, six hundred forty thousand, five hundred four".