3939689 has 4 divisors (see below), whose sum is σ = 4242756. Its totient is φ = 3636624.

The previous prime is 3939673. The next prime is 3939713. The reversal of 3939689 is 9869393.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2301289 + 1638400 = 1517^2 + 1280^2 .

It is a cyclic number.

It is not a de Polignac number, because 3939689 - 2⁴ = 3939673 is a prime.

It is a super-2 number, since 2×3939689² = 31042298833442, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3939619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151514 + ... + 151539.

It is an arithmetic number, because the mean of its divisors is an integer number (1060689).

Almost surely, 2^3939689 is an apocalyptic number.

It is an amenable number.

3939689 is a deficient number, since it is larger than the sum of its proper divisors (303067).

3939689 is a wasteful number, since it uses less digits than its factorization.

3939689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303066.

The product of its digits is 314928, while the sum is 47.

The square root of 3939689 is about 1984.8649828137. The cubic root of 3939689 is about 157.9382469779.

The spelling of 3939689 in words is "three million, nine hundred thirty-nine thousand, six hundred eighty-nine".