402004220 has 48 divisors (see below), whose sum is σ = 853620768. Its totient is φ = 159022080.

The previous prime is 402004217. The next prime is 402004247. The reversal of 402004220 is 22400204.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 402004195 and 402004204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1309307 + ... + 1309613.

It is an arithmetic number, because the mean of its divisors is an integer number (17783766).

Almost surely, 2^402004220 is an apocalyptic number.

It is an amenable number.

402004220 is an abundant number, since it is smaller than the sum of its proper divisors (451616548).

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

402004220 is a wasteful number, since it uses less digits than its factorization.

402004220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830 (or 828 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 14.

The square root of 402004220 is about 20050.0428927222. The cubic root of 402004220 is about 738.0348517017.

Adding to 402004220 its reverse (22400204), we get a palindrome (424404424).

The spelling of 402004220 in words is "four hundred two million, four thousand, two hundred twenty".