4003866 has 12 divisors (see below), whose sum is σ = 8675082. Its totient is φ = 1334616.

The previous prime is 4003861. The next prime is 4003871. The reversal of 4003866 is 6683004.

It is an interprime number because it is at equal distance from previous prime (4003861) and next prime (4003871).

It can be written as a sum of positive squares in only one way, i.e., 3884841 + 119025 = 1971^2 + 345^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4003861) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 111201 + ... + 111236.

Almost surely, 2^4003866 is an apocalyptic number.

4003866 is an abundant number, since it is smaller than the sum of its proper divisors (4671216).

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

4003866 is a wasteful number, since it uses less digits than its factorization.

4003866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222445 (or 222442 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 4003866 is about 2000.9662665822. The cubic root of 4003866 is about 158.7912295004.

It can be divided in two parts, 40038 and 66, that added together give a palindrome (40104).

The spelling of 4003866 in words is "four million, three thousand, eight hundred sixty-six".