1640522 has 8 divisors (see below), whose sum is σ = 2650116. Its totient is φ = 757152.

The previous prime is 1640519. The next prime is 1640531. The reversal of 1640522 is 2250461.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1190281 + 450241 = 1091^2 + 671^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1640494 and 1640503.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 31523 + ... + 31574.

2^1640522 is an apocalyptic number.

1640522 is a deficient number, since it is larger than the sum of its proper divisors (1009594).

1640522 is a wasteful number, since it uses less digits than its factorization.

1640522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63112.

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

The square root of 1640522 is about 1280.8286380309. The cubic root of 1640522 is about 117.9398812786.

Adding to 1640522 its reverse (2250461), we get a palindrome (3890983).

The spelling of 1640522 in words is "one million, six hundred forty thousand, five hundred twenty-two".