8218402 has 4 divisors (see below), whose sum is σ = 12327606. Its totient is φ = 4109200.

The previous prime is 8218391. The next prime is 8218423. The reversal of 8218402 is 2048128.

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., 8173881 + 44521 = 2859^2 + 211^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2054599 + ... + 2054602.

Almost surely, 2^8218402 is an apocalyptic number.

8218402 is a deficient number, since it is larger than the sum of its proper divisors (4109204).

8218402 is a wasteful number, since it uses less digits than its factorization.

8218402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4109203.

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 8218402 is about 2866.7755405682. The cubic root of 8218402 is about 201.8037010784.

The spelling of 8218402 in words is "eight million, two hundred eighteen thousand, four hundred two".