3989247 has 16 divisors (see below), whose sum is σ = 5483520. Its totient is φ = 2578752.

The previous prime is 3989243. The next prime is 3989261. The reversal of 3989247 is 7429893.

It is not a de Polignac number, because 3989247 - 2² = 3989243 is a prime.

3989247 is a lucky number.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 3989199 and 3989208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3989243) 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, 17778 + ... + 18000.

It is an arithmetic number, because the mean of its divisors is an integer number (342720).

Almost surely, 2^3989247 is an apocalyptic number.

3989247 is a deficient number, since it is larger than the sum of its proper divisors (1494273).

3989247 is a wasteful number, since it uses less digits than its factorization.

3989247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382.

The product of its digits is 108864, while the sum is 42.

The square root of 3989247 is about 1997.3099408955. The cubic root of 3989247 is about 158.5977331807.

The spelling of 3989247 in words is "three million, nine hundred eighty-nine thousand, two hundred forty-seven".