1640806 has 8 divisors (see below), whose sum is σ = 2606040. Its totient is φ = 772128.

The previous prime is 1640803. The next prime is 1640809. The reversal of 1640806 is 6080461.

It is an interprime number because it is at equal distance from previous prime (1640803) and next prime (1640809).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24096 + ... + 24163.

It is an arithmetic number, because the mean of its divisors is an integer number (325755).

2^1640806 is an apocalyptic number.

1640806 is a deficient number, since it is larger than the sum of its proper divisors (965234).

1640806 is a wasteful number, since it uses less digits than its factorization.

1640806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48278.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 1640806 is about 1280.9394989616. The cubic root of 1640806 is about 117.9466866315.

The spelling of 1640806 in words is "one million, six hundred forty thousand, eight hundred six".