821402 has 4 divisors (see below), whose sum is σ = 1232106. Its totient is φ = 410700.

The previous prime is 821383. The next prime is 821411. The reversal of 821402 is 204128.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 737881 + 83521 = 859^2 + 289^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 205349 + ... + 205352.

2⁸²¹⁴⁰² is an apocalyptic number.

821402 is a deficient number, since it is larger than the sum of its proper divisors (410704).

821402 is a wasteful number, since it uses less digits than its factorization.

821402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410703.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 821402 is about 906.3123082029. The cubic root of 821402 is about 93.6523296882.

The spelling of 821402 in words is "eight hundred twenty-one thousand, four hundred two".