1640322 has 12 divisors (see below), whose sum is σ = 3554070. Its totient is φ = 546768.

The previous prime is 1640311. The next prime is 1640323. The reversal of 1640322 is 2230461.

It is a happy number.

1640322 is a `hidden beast` number, since 1 + 640 + 3 + 22 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1418481 + 221841 = 1191^2 + 471^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 91129 = 1640322 / (1 + 6 + 4 + 0 + 3 + 2 + 2).

It is a d-powerful number, because it can be written as 1 + 6³ + 4¹⁰ + 0 + 3¹⁰ + 2¹³ + 2¹⁹ .

It is a junction number, because it is equal to n+sod(n) for n = 1640295 and 1640304.

It is not an unprimeable number, because it can be changed into a prime (1640323) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 45547 + ... + 45582.

2^1640322 is an apocalyptic number.

1640322 is an abundant number, since it is smaller than the sum of its proper divisors (1913748).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1640322 is a wasteful number, since it uses less digits than its factorization.

1640322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91137 (or 91134 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1640322 is about 1280.7505611945. The cubic root of 1640322 is about 117.9350883052.

Adding to 1640322 its reverse (2230461), we get a palindrome (3870783).

The spelling of 1640322 in words is "one million, six hundred forty thousand, three hundred twenty-two".