821473 has 4 divisors (see below), whose sum is σ = 826560. Its totient is φ = 816388.

The previous prime is 821467. The next prime is 821477. The reversal of 821473 is 374128.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 821473 - 2⁵ = 821441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (821477) 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, 2293 + ... + 2626.

It is an arithmetic number, because the mean of its divisors is an integer number (206640).

2⁸²¹⁴⁷³ is an apocalyptic number.

It is an amenable number.

821473 is a deficient number, since it is larger than the sum of its proper divisors (5087).

821473 is a wasteful number, since it uses less digits than its factorization.

821473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5086.

The product of its digits is 1344, while the sum is 25.

The square root of 821473 is about 906.3514770772. The cubic root of 821473 is about 93.6550279706.

It can be divided in two parts, 82 and 1473, that multiplied together give a triangular number (120786 = T₄₉₁).

The spelling of 821473 in words is "eight hundred twenty-one thousand, four hundred seventy-three".