3949 has 4 divisors (see below), whose sum is σ = 4320. Its totient is φ = 3580.

The previous prime is 3947. The next prime is 3967. The reversal of 3949 is 9493.

3949 is nontrivially palindromic in base 7.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9493 = 11 ⋅863.

It is a cyclic number.

It is not a de Polignac number, because 3949 - 2¹ = 3947 is a prime.

It is a d-powerful number, because it can be written as 3⁷ + 4⁵ + 9 + 9³ .

It is a Duffinian number.

It is a plaindrome in base 5.

It is a nialpdrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3943) 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, 169 + ... + 190.

It is an arithmetic number, because the mean of its divisors is an integer number (1080).

It is an amenable number.

3949 is a deficient number, since it is larger than the sum of its proper divisors (371).

3949 is a wasteful number, since it uses less digits than its factorization.

3949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370.

The product of its digits is 972, while the sum is 25.

The square root of 3949 is about 62.8410693735. The cubic root of 3949 is about 15.8062572023.

It can be divided in two parts, 39 and 49, that added together give a palindrome (88).

The spelling of 3949 in words is "three thousand, nine hundred forty-nine".