3990007 has 4 divisors (see below), whose sum is σ = 4560016.
Its totient is φ = 3420000.
The previous prime is 3990001. The next prime is 3990011. The reversal of 3990007 is 7000993.
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7000993 = 23 ⋅304391.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-3990007 is a prime.
It is the 1998-th Hogben number.
It is a Duffinian 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 nontrivial repunit in base 1997.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 284994 + ... + 285007.
It is an arithmetic number, because the mean of its divisors is an integer number (1140004).
Almost surely, 23990007 is an apocalyptic number.
3990007 is a deficient number, since it is larger than the sum of its proper divisors (570009).
3990007 is an equidigital number, since it uses as much as digits as its factorization.
3990007 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 570008.
The product of its (nonzero) digits is 1701, while the sum is 28.
The square root of 3990007 is about 1997.5001877347.
The cubic root of 3990007 is about 158.6078041393.
The spelling of 3990007 in words is "three million, nine hundred ninety thousand, seven".