402220 has 72 divisors (see below), whose sum is σ = 1106784. Its totient is φ = 119808.
The previous prime is 402197. The next prime is 402221. The reversal of 402220 is 22204.
It is a happy number.
It is a Harshad number since it is a multiple of its sum of digits (10).
It is a nialpdrome in base 13.
It is a zygodrome in base 13.
It is a junction number, because it is equal to n+sod(n) for n = 402197 and 402206.
It is not an unprimeable number, because it can be changed into a prime (402221) 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, 23652 + ... + 23668.
It is an arithmetic number, because the mean of its divisors is an integer number (15372).
2402220 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 402220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (553392).
402220 is an abundant number, since it is smaller than the sum of its proper divisors (704564).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
402220 is a wasteful number, since it uses less digits than its factorization.
402220 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 59 (or 44 counting only the distinct ones).
The product of its (nonzero) digits is 32, while the sum is 10.
The square root of 402220 is about 634.2081677178. The cubic root of 402220 is about 73.8166877410.
Adding to 402220 its reverse (22204), we get a palindrome (424424).
The spelling of 402220 in words is "four hundred two thousand, two hundred twenty", and thus it is an iban number.
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