1640530 has 16 divisors (see below), whose sum is σ = 3055320. Its totient is φ = 633472.

The previous prime is 1640519. The next prime is 1640531. The reversal of 1640530 is 350461.

It can be written as a sum of positive squares in 4 ways, for example, as 986049 + 654481 = 993^2 + 809^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1640498 and 1640507.

It is not an unprimeable number, because it can be changed into a prime (1640531) 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 7 ways as a sum of consecutive naturals, for example, 2539 + ... + 3118.

2^1640530 is an apocalyptic number.

1640530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1640530 is a deficient number, since it is larger than the sum of its proper divisors (1414790).

1640530 is a wasteful number, since it uses less digits than its factorization.

1640530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5693.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 1640530 is about 1280.8317610053. The cubic root of 1640530 is about 117.9400729894.

Adding to 1640530 its reverse (350461), we get a palindrome (1990991).

The spelling of 1640530 in words is "one million, six hundred forty thousand, five hundred thirty".