402424220 has 72 divisors (see below), whose sum is σ = 935096400. Its totient is φ = 145361920.

The previous prime is 402424207. The next prime is 402424223. The reversal of 402424220 is 22424204.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 402424192 and 402424201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402424223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 432716 + ... + 433644.

It is an arithmetic number, because the mean of its divisors is an integer number (12987450).

Almost surely, 2^402424220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 402424220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (467548200).

402424220 is an abundant number, since it is smaller than the sum of its proper divisors (532672180).

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

402424220 is a wasteful number, since it uses less digits than its factorization.

402424220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139 (or 1126 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 20.

The square root of 402424220 is about 20060.5139515417. The cubic root of 402424220 is about 738.2917866083.

Adding to 402424220 its reverse (22424204), we get a palindrome (424848424).

The spelling of 402424220 in words is "four hundred two million, four hundred twenty-four thousand, two hundred twenty".