1318821 has 8 divisors (see below), whose sum is σ = 2009664. Its totient is φ = 753600.

The previous prime is 1318789. The next prime is 1318829. The reversal of 1318821 is 1288131.

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

It is not a de Polignac number, because 1318821 - 2⁵ = 1318789 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1318791 and 1318800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1318829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31380 + ... + 31421.

It is an arithmetic number, because the mean of its divisors is an integer number (251208).

2^1318821 is an apocalyptic number.

It is an amenable number.

1318821 is a deficient number, since it is larger than the sum of its proper divisors (690843).

1318821 is an equidigital number, since it uses as much as digits as its factorization.

1318821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62811.

The product of its digits is 384, while the sum is 24.

The square root of 1318821 is about 1148.3993207939. The cubic root of 1318821 is about 109.6634617903.

The spelling of 1318821 in words is "one million, three hundred eighteen thousand, eight hundred twenty-one".