402228 has 18 divisors (see below), whose sum is σ = 1016834. Its totient is φ = 134064.

The previous prime is 402223. The next prime is 402239. The reversal of 402228 is 822204.

It can be written as a sum of positive squares in only one way, i.e., 338724 + 63504 = 582^2 + 252^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 402228.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402221) by changing a digit.

402228 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5551 + ... + 5622.

2⁴⁰²²²⁸ is an apocalyptic number.

It is an amenable number.

402228 is an abundant number, since it is smaller than the sum of its proper divisors (614606).

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

402228 is a wasteful number, since it uses less digits than its factorization.

402228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11183 (or 11178 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 402228 is about 634.2144747639. The cubic root of 402228 is about 73.8171771328.

It can be divided in two parts, 402 and 228, that added together give a triangular number (630 = T₃₅).

The spelling of 402228 in words is "four hundred two thousand, two hundred twenty-eight".