1018821 has 8 divisors (see below), whose sum is σ = 1365280. Its totient is φ = 675792.

The previous prime is 1018817. The next prime is 1018859. The reversal of 1018821 is 1288101.

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

It is not a de Polignac number, because 1018821 - 2² = 1018817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1018811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55 + ... + 1428.

It is an arithmetic number, because the mean of its divisors is an integer number (170660).

2^1018821 is an apocalyptic number.

It is an amenable number.

1018821 is a deficient number, since it is larger than the sum of its proper divisors (346459).

1018821 is a wasteful number, since it uses less digits than its factorization.

1018821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1715.

The product of its (nonzero) digits is 128, while the sum is 21.

The square root of 1018821 is about 1009.3666330923. The cubic root of 1018821 is about 100.6234714221.

The spelling of 1018821 in words is "one million, eighteen thousand, eight hundred twenty-one".