1640518 has 12 divisors (see below), whose sum is σ = 2705220. Its totient is φ = 745580.

The previous prime is 1640503. The next prime is 1640519. The reversal of 1640518 is 8150461.

It is a junction number, because it is equal to n+sod(n) for n = 1640492 and 1640501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640519) 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 in 5 ways as a sum of consecutive naturals, for example, 3148 + ... + 3631.

It is an arithmetic number, because the mean of its divisors is an integer number (225435).

2^1640518 is an apocalyptic number.

1640518 is a deficient number, since it is larger than the sum of its proper divisors (1064702).

1640518 is a wasteful number, since it uses less digits than its factorization.

1640518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6803 (or 6792 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 1640518 is about 1280.8270765408. The cubic root of 1640518 is about 117.9397854229.

Adding to 1640518 its reverse (8150461), we get a palindrome (9790979).

The spelling of 1640518 in words is "one million, six hundred forty thousand, five hundred eighteen".