1640422 has 24 divisors (see below), whose sum is σ = 3016440. Its totient is φ = 665280.

The previous prime is 1640399. The next prime is 1640423. The reversal of 1640422 is 2240461.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 1640422.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1422 + ... + 2302.

It is an arithmetic number, because the mean of its divisors is an integer number (125685).

2^1640422 is an apocalyptic number.

1640422 is a deficient number, since it is larger than the sum of its proper divisors (1376018).

1640422 is a wasteful number, since it uses less digits than its factorization.

1640422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 916 (or 909 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 1640422 is about 1280.7896002076. The cubic root of 1640422 is about 117.9374848406.

Adding to 1640422 its reverse (2240461), we get a palindrome (3880883).

The spelling of 1640422 in words is "one million, six hundred forty thousand, four hundred twenty-two".