1806481 has 4 divisors (see below), whose sum is σ = 1823472. Its totient is φ = 1789492.

The previous prime is 1806479. The next prime is 1806487. The reversal of 1806481 is 1846081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1806481 - 2¹ = 1806479 is a prime.

It is a super-2 number, since 2×1806481² = 6526747206722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1806487) 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, 8335 + ... + 8548.

It is an arithmetic number, because the mean of its divisors is an integer number (455868).

2^1806481 is an apocalyptic number.

It is an amenable number.

1806481 is a deficient number, since it is larger than the sum of its proper divisors (16991).

1806481 is a wasteful number, since it uses less digits than its factorization.

1806481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16990.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 1806481 is about 1344.0539423699. The cubic root of 1806481 is about 121.7898604142.

It can be divided in two parts, 18064 and 81, that added together give a triangular number (18145 = T₁₉₀).

The spelling of 1806481 in words is "one million, eight hundred six thousand, four hundred eighty-one".