4221855 has 32 divisors (see below), whose sum is σ = 8190720. Its totient is φ = 2046240.
The previous prime is 4221851. The next prime is 4221883. The reversal of 4221855 is 5581224.
It is a happy number.
4221855 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.
It is not a de Polignac number, because 4221855 - 22 = 4221851 is a prime.
It is a hoax number, since the sum of its digits (27) 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 (27).
It is an Ulam number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (4221851) 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, 64 + ... + 2906.
It is an arithmetic number, because the mean of its divisors is an integer number (255960).
Almost surely, 24221855 is an apocalyptic number.
4221855 is a gapful number since it is divisible by the number (45) formed by its first and last digit.
4221855 is a deficient number, since it is larger than the sum of its proper divisors (3968865).
4221855 is a wasteful number, since it uses less digits than its factorization.
4221855 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 2868 (or 2862 counting only the distinct ones).
The product of its digits is 3200, while the sum is 27.
The square root of 4221855 is about 2054.7153087472. The cubic root of 4221855 is about 161.6222336293.
The spelling of 4221855 in words is "four million, two hundred twenty-one thousand, eight hundred fifty-five".
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