1840406 has 4 divisors (see below), whose sum is σ = 2760612. Its totient is φ = 920202.

The previous prime is 1840393. The next prime is 1840429. The reversal of 1840406 is 6040481.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6040481 = 97 ⋅62273.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460100 + ... + 460103.

It is an arithmetic number, because the mean of its divisors is an integer number (690153).

2^1840406 is an apocalyptic number.

1840406 is a deficient number, since it is larger than the sum of its proper divisors (920206).

1840406 is an equidigital number, since it uses as much as digits as its factorization.

1840406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 920205.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 1840406 is about 1356.6156419561. The cubic root of 1840406 is about 122.5475256382.

Adding to 1840406 its reverse (6040481), we get a palindrome (7880887).

The spelling of 1840406 in words is "one million, eight hundred forty thousand, four hundred six".