402218384 has 20 divisors (see below), whose sum is σ = 792075420. Its totient is φ = 197811840.

The previous prime is 402218359. The next prime is 402218389. The reversal of 402218384 is 483812204.

It can be written as a sum of positive squares in 2 ways, for example, as 82810000 + 319408384 = 9100^2 + 17872^2 .

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 402218384.

It is not an unprimeable number, because it can be changed into a prime (402218389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205079 + ... + 207030.

It is an arithmetic number, because the mean of its divisors is an integer number (39603771).

Almost surely, 2^402218384 is an apocalyptic number.

It is an amenable number.

402218384 is a deficient number, since it is larger than the sum of its proper divisors (389857036).

402218384 is a wasteful number, since it uses less digits than its factorization.

402218384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412178 (or 412172 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 32.

The square root of 402218384 is about 20055.3829183090. The cubic root of 402218384 is about 738.1658888302.

The spelling of 402218384 in words is "four hundred two million, two hundred eighteen thousand, three hundred eighty-four".