3999667 has 4 divisors (see below), whose sum is σ = 4571056. Its totient is φ = 3428280.

The previous prime is 3999661. The next prime is 3999683. The reversal of 3999667 is 7669993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7669993 = 41 ⋅187073.

It is a cyclic number.

It is not a de Polignac number, because 3999667 - 2³ = 3999659 is a prime.

It is a super-2 number, since 2×3999667² = 31994672221778, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3999667.

It is not an unprimeable number, because it can be changed into a prime (3999661) 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, 285684 + ... + 285697.

It is an arithmetic number, because the mean of its divisors is an integer number (1142764).

Almost surely, 2^3999667 is an apocalyptic number.

3999667 is a deficient number, since it is larger than the sum of its proper divisors (571389).

3999667 is an equidigital number, since it uses as much as digits as its factorization.

3999667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571388.

The product of its digits is 551124, while the sum is 49.

The square root of 3999667 is about 1999.9167482673. The cubic root of 3999667 is about 158.7357000367.

The spelling of 3999667 in words is "three million, nine hundred ninety-nine thousand, six hundred sixty-seven".