3867999 has 4 divisors (see below), whose sum is σ = 5157336. Its totient is φ = 2578664.

The previous prime is 3867961. The next prime is 3868003. The reversal of 3867999 is 9997683.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3867999 - 2¹¹ = 3865951 is a prime.

It is a super-2 number, since 2×3867999² = 29922832528002, which contains 22 as substring.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3867599) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 644664 + ... + 644669.

It is an arithmetic number, because the mean of its divisors is an integer number (1289334).

Almost surely, 2^3867999 is an apocalyptic number.

3867999 is a deficient number, since it is larger than the sum of its proper divisors (1289337).

3867999 is a wasteful number, since it uses less digits than its factorization.

3867999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1289336.

The product of its digits is 734832, while the sum is 51.

The square root of 3867999 is about 1966.7229088003. The cubic root of 3867999 is about 156.9743828814.

It can be divided in two parts, 386 and 7999, that added together give a triangular number (8385 = T₁₂₉).

The spelling of 3867999 in words is "three million, eight hundred sixty-seven thousand, nine hundred ninety-nine".