3939869 has 8 divisors (see below), whose sum is σ = 4261248. Its totient is φ = 3628480.

The previous prime is 3939851. The next prime is 3939899. The reversal of 3939869 is 9689393.

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

It is not a de Polignac number, because 3939869 - 2¹⁶ = 3874333 is a prime.

It is a super-2 number, since 2×3939869² = 31045135474322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3939829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1667 + ... + 3264.

It is an arithmetic number, because the mean of its divisors is an integer number (532656).

Almost surely, 2^3939869 is an apocalyptic number.

It is an amenable number.

3939869 is a deficient number, since it is larger than the sum of its proper divisors (321379).

3939869 is a wasteful number, since it uses less digits than its factorization.

3939869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4995.

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

The square root of 3939869 is about 1984.9103254303. The cubic root of 3939869 is about 157.9406522821.

The spelling of 3939869 in words is "three million, nine hundred thirty-nine thousand, eight hundred sixty-nine".