1803406 has 8 divisors (see below), whose sum is σ = 2951064. Its totient is φ = 819720.

The previous prime is 1803383. The next prime is 1803419. The reversal of 1803406 is 6043081.

1803406 = 45² + 46² + ... + 176².

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

It is a Harshad number since it is a multiple of its sum of digits (22), and also a Moran number because the ratio is a prime number: 81973 = 1803406 / (1 + 8 + 0 + 3 + 4 + 0 + 6).

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40965 + ... + 41008.

It is an arithmetic number, because the mean of its divisors is an integer number (368883).

2^1803406 is an apocalyptic number.

1803406 is a deficient number, since it is larger than the sum of its proper divisors (1147658).

1803406 is a wasteful number, since it uses less digits than its factorization.

1803406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81986.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 1803406 is about 1342.9095278536. The cubic root of 1803406 is about 121.7207174200.

Adding to 1803406 its reverse (6043081), we get a palindrome (7846487).

It can be divided in two parts, 1803 and 406, that added together give a square (2209 = 47²).

The spelling of 1803406 in words is "one million, eight hundred three thousand, four hundred six".