821418 has 16 divisors (see below), whose sum is σ = 1769376. Its totient is φ = 252720.

The previous prime is 821411. The next prime is 821441. The reversal of 821418 is 814128.

It is not an unprimeable number, because it can be changed into a prime (821411) 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, 5188 + ... + 5343.

It is an arithmetic number, because the mean of its divisors is an integer number (110586).

2⁸²¹⁴¹⁸ is an apocalyptic number.

821418 is an abundant number, since it is smaller than the sum of its proper divisors (947958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

821418 is a wasteful number, since it uses less digits than its factorization.

821418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10549.

The product of its digits is 512, while the sum is 24.

The square root of 821418 is about 906.3211351392. The cubic root of 821418 is about 93.6529377654.

The spelling of 821418 in words is "eight hundred twenty-one thousand, four hundred eighteen".