3979 has 4 divisors (see below), whose sum is σ = 4176.
Its totient is φ = 3784.
The previous prime is 3967. The next prime is 3989. The reversal of 3979 is 9793.
Subtracting from 3979 its product of digits (1701), we obtain a triangular number (2278 = T67).
It can be divided in two parts, 397 and 9, that added together give a triangular number (406 = T28).
3979 = T50 + T51 +
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9793 = 7 ⋅1399.
It is a cyclic number.
It is not a de Polignac number, because 3979 - 25 = 3947 is a prime.
It is a Duffinian number.
It is a plaindrome in base 12.
It is a nialpdrome in base 9.
It is not an unprimeable number, because it can be changed into a prime (3919) 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, 64 + ... + 109.
It is an arithmetic number, because the mean of its divisors is an integer number (1044).
23979 is an apocalyptic number.
3979 is the 52-nd centered triangular number.
3979 is a deficient number, since it is larger than the sum of its proper divisors (197).
3979 is a wasteful number, since it uses less digits than its factorization.
3979 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 196.
The product of its digits is 1701, while the sum is 28.
The square root of 3979 is about 63.0793151516.
The cubic root of 3979 is about 15.8461822448.
The spelling of 3979 in words is "three thousand, nine hundred seventy-nine".