1640473 has 4 divisors (see below), whose sum is σ = 1667428. Its totient is φ = 1613520.

The previous prime is 1640467. The next prime is 1640497. The reversal of 1640473 is 3740461.

1640473 is nontrivially palindromic in base 4.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 788544 + 851929 = 888^2 + 923^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1640473 is a prime.

It is a Duffinian 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 (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13386 + ... + 13507.

It is an arithmetic number, because the mean of its divisors is an integer number (416857).

2^1640473 is an apocalyptic number.

It is an amenable number.

1640473 is a deficient number, since it is larger than the sum of its proper divisors (26955).

1640473 is an equidigital number, since it uses as much as digits as its factorization.

1640473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26954.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 1640473 is about 1280.8095096461. The cubic root of 1640473 is about 117.9387070361.

The spelling of 1640473 in words is "one million, six hundred forty thousand, four hundred seventy-three".