1816401 has 8 divisors (see below), whose sum is σ = 2449440. Its totient is φ = 1197152.

The previous prime is 1816387. The next prime is 1816403. The reversal of 1816401 is 1046181.

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

It is a cyclic number.

It is not a de Polignac number, because 1816401 - 2⁶ = 1816337 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1816403) 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 7 ways as a sum of consecutive naturals, for example, 3135 + ... + 3668.

It is an arithmetic number, because the mean of its divisors is an integer number (306180).

2^1816401 is an apocalyptic number.

It is an amenable number.

1816401 is a deficient number, since it is larger than the sum of its proper divisors (633039).

1816401 is an equidigital number, since it uses as much as digits as its factorization.

1816401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6895.

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 1816401 is about 1347.7392180982. The cubic root of 1816401 is about 122.0123834066.

The spelling of 1816401 in words is "one million, eight hundred sixteen thousand, four hundred one".