821464 has 16 divisors (see below), whose sum is σ = 1760400. Its totient is φ = 352032.

The previous prime is 821461. The next prime is 821467. The reversal of 821464 is 464128.

It is an interprime number because it is at equal distance from previous prime (821461) and next prime (821467).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821461) 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, 7279 + ... + 7390.

It is an arithmetic number, because the mean of its divisors is an integer number (110025).

2⁸²¹⁴⁶⁴ is an apocalyptic number.

It is an amenable number.

821464 is an abundant number, since it is smaller than the sum of its proper divisors (938936).

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

821464 is a wasteful number, since it uses less digits than its factorization.

821464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14682 (or 14678 counting only the distinct ones).

The product of its digits is 1536, while the sum is 25.

The square root of 821464 is about 906.3465121023. The cubic root of 821464 is about 93.6546859434.

The spelling of 821464 in words is "eight hundred twenty-one thousand, four hundred sixty-four".