402004218 has 64 divisors (see below), whose sum is σ = 1034772480. Its totient is φ = 101044800.

The previous prime is 402004217. The next prime is 402004247. The reversal of 402004218 is 812400204.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 402004194 and 402004203.

It is not an unprimeable number, because it can be changed into a prime (402004217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 288 + ... + 28356.

It is an arithmetic number, because the mean of its divisors is an integer number (16168320).

Almost surely, 2^402004218 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 402004218, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (517386240).

402004218 is an abundant number, since it is smaller than the sum of its proper divisors (632768262).

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

402004218 is a wasteful number, since it uses less digits than its factorization.

402004218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28123.

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 402004218 is about 20050.0428428470. The cubic root of 402004218 is about 738.0348504778.

The spelling of 402004218 in words is "four hundred two million, four thousand, two hundred eighteen".