1418821 has 4 divisors (see below), whose sum is σ = 1422700. Its totient is φ = 1414944.

The previous prime is 1418797. The next prime is 1418831. The reversal of 1418821 is 1288141.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1288141 = 17 ⋅75773.

It can be written as a sum of positive squares in 2 ways, for example, as 617796 + 801025 = 786^2 + 895^2 .

It is a 3-Lehmer number, since φ(1418821) divides (1418821-1)³.

It is a cyclic number.

It is not a de Polignac number, because 1418821 - 2⁷ = 1418693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1418831) 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, 1326 + ... + 2143.

It is an arithmetic number, because the mean of its divisors is an integer number (355675).

2^1418821 is an apocalyptic number.

It is an amenable number.

1418821 is a deficient number, since it is larger than the sum of its proper divisors (3879).

1418821 is an equidigital number, since it uses as much as digits as its factorization.

1418821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3878.

The product of its digits is 512, while the sum is 25.

The square root of 1418821 is about 1191.1427286434. The cubic root of 1418821 is about 112.3679702136.

The spelling of 1418821 in words is "one million, four hundred eighteen thousand, eight hundred twenty-one".