1816481 has 4 divisors (see below), whose sum is σ = 1830912. Its totient is φ = 1802052.

The previous prime is 1816453. The next prime is 1816489. The reversal of 1816481 is 1846181.

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 a de Polignac number, because none of the positive numbers 2^k-1816481 is a prime.

It is a super-2 number, since 2×1816481² = 6599206446722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1816489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7025 + ... + 7278.

It is an arithmetic number, because the mean of its divisors is an integer number (457728).

2^1816481 is an apocalyptic number.

It is an amenable number.

1816481 is a deficient number, since it is larger than the sum of its proper divisors (14431).

1816481 is a wasteful number, since it uses less digits than its factorization.

1816481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14430.

The product of its digits is 1536, while the sum is 29.

The square root of 1816481 is about 1347.7688971037. The cubic root of 1816481 is about 122.0141746497.

The spelling of 1816481 in words is "one million, eight hundred sixteen thousand, four hundred eighty-one".