1818401 has 8 divisors (see below), whose sum is σ = 1974504. Its totient is φ = 1664640.

The previous prime is 1818379. The next prime is 1818407. The reversal of 1818401 is 1048181.

It can be written as a sum of positive squares in 4 ways, for example, as 141376 + 1677025 = 376^2 + 1295^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1818401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1818407) 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, 1271 + ... + 2291.

It is an arithmetic number, because the mean of its divisors is an integer number (246813).

2^1818401 is an apocalyptic number.

It is an amenable number.

1818401 is a deficient number, since it is larger than the sum of its proper divisors (156103).

1818401 is a wasteful number, since it uses less digits than its factorization.

1818401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1171.

The product of its (nonzero) digits is 256, while the sum is 23.

The square root of 1818401 is about 1348.4809972706. The cubic root of 1818401 is about 122.0571487160.

The spelling of 1818401 in words is "one million, eight hundred eighteen thousand, four hundred one".