1640330 has 16 divisors (see below), whose sum is σ = 3126600. Its totient is φ = 617472.

The previous prime is 1640323. The next prime is 1640333. The reversal of 1640330 is 330461.

It can be written as a sum of positive squares in 4 ways, for example, as 1203409 + 436921 = 1097^2 + 661^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1640299 and 1640308.

It is not an unprimeable number, because it can be changed into a prime (1640333) 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, 4655 + ... + 4994.

2^1640330 is an apocalyptic number.

1640330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1640330 is a deficient number, since it is larger than the sum of its proper divisors (1486270).

1640330 is a wasteful number, since it uses less digits than its factorization.

1640330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9673.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 1640330 is about 1280.7536843593. The cubic root of 1640330 is about 117.9352800316.

Adding to 1640330 its reverse (330461), we get a palindrome (1970791).

The spelling of 1640330 in words is "one million, six hundred forty thousand, three hundred thirty".