3990205 has 8 divisors (see below), whose sum is σ = 4804704. Its totient is φ = 3181200.

The previous prime is 3990187. The next prime is 3990241. The reversal of 3990205 is 5020993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-3990205 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 450 + ... + 2860.

It is an arithmetic number, because the mean of its divisors is an integer number (600588).

Almost surely, 2^3990205 is an apocalyptic number.

It is an amenable number.

3990205 is a deficient number, since it is larger than the sum of its proper divisors (814499).

3990205 is a wasteful number, since it uses less digits than its factorization.

3990205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2747.

The product of its (nonzero) digits is 2430, while the sum is 28.

The square root of 3990205 is about 1997.5497490676. The cubic root of 3990205 is about 158.6104276790.

The spelling of 3990205 in words is "three million, nine hundred ninety thousand, two hundred five".