3990006 has 32 divisors (see below), whose sum is σ = 9110880. Its totient is φ = 1293408.

The previous prime is 3990001. The next prime is 3990011. The reversal of 3990006 is 6000993.

It is an interprime number because it is at equal distance from previous prime (3990001) and next prime (3990011).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3990001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1000 + ... + 2996.

It is an arithmetic number, because the mean of its divisors is an integer number (284715).

Almost surely, 2^3990006 is an apocalyptic number.

It is a pronic number, being equal to 1997×1998.

It is a practical number, because each smaller number is the sum of distinct divisors of 3990006, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4555440).

3990006 is an abundant number, since it is smaller than the sum of its proper divisors (5120874).

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

3990006 is a wasteful number, since it uses less digits than its factorization.

3990006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2045 (or 2039 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 27.

The square root of 3990006 is about 1997.4999374218. The cubic root of 3990006 is about 158.6077908888.

Adding to 3990006 its reverse (6000993), we get a palindrome (9990999).

The spelling of 3990006 in words is "three million, nine hundred ninety thousand, six".