3999222 has 24 divisors (see below), whose sum is σ = 8877960. Its totient is φ = 1300320.

The previous prime is 3999211. The next prime is 3999239. The reversal of 3999222 is 2229993.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1972 + ... + 3447.

It is an arithmetic number, because the mean of its divisors is an integer number (369915).

Almost surely, 2^3999222 is an apocalyptic number.

3999222 is an abundant number, since it is smaller than the sum of its proper divisors (4878738).

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

3999222 is a wasteful number, since it uses less digits than its factorization.

3999222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5468 (or 5465 counting only the distinct ones).

The product of its digits is 17496, while the sum is 36.

The square root of 3999222 is about 1999.8054905415. The cubic root of 3999222 is about 158.7298128794.

It can be divided in two parts, 3999 and 222, that multiplied together give a triangular number (887778 = T₁₃₃₂).

The spelling of 3999222 in words is "three million, nine hundred ninety-nine thousand, two hundred twenty-two".