3990869 has 8 divisors (see below), whose sum is σ = 4252248. Its totient is φ = 3732480.

The previous prime is 3990863. The next prime is 3990901. The reversal of 3990869 is 9680993.

It can be written as a sum of positive squares in 4 ways, for example, as 1144900 + 2845969 = 1070^2 + 1687^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 3990869 - 2⁴ = 3990853 is a prime.

It is a super-2 number, since 2×3990869² = 31854070750322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3990863) 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 7 ways as a sum of consecutive naturals, for example, 2429 + ... + 3725.

It is an arithmetic number, because the mean of its divisors is an integer number (531531).

Almost surely, 2^3990869 is an apocalyptic number.

It is an amenable number.

3990869 is a deficient number, since it is larger than the sum of its proper divisors (261379).

3990869 is a wasteful number, since it uses less digits than its factorization.

3990869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1495.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 3990869 is about 1997.7159457741. The cubic root of 3990869 is about 158.6192251788.

The spelling of 3990869 in words is "three million, nine hundred ninety thousand, eight hundred sixty-nine".