402664218 has 16 divisors (see below), whose sum is σ = 878540256. Its totient is φ = 122019440.

The previous prime is 402664153. The next prime is 402664231. The reversal of 402664218 is 812466204.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3050421 + ... + 3050552.

It is an arithmetic number, because the mean of its divisors is an integer number (54908766).

Almost surely, 2^402664218 is an apocalyptic number.

402664218 is an abundant number, since it is smaller than the sum of its proper divisors (475876038).

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

402664218 is a wasteful number, since it uses less digits than its factorization.

402664218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6100989.

The product of its (nonzero) digits is 18432, while the sum is 33.

The square root of 402664218 is about 20066.4949106714. The cubic root of 402664218 is about 738.4385250758.

The spelling of 402664218 in words is "four hundred two million, six hundred sixty-four thousand, two hundred eighteen".