39979 has 2 divisors, whose sum is σ = 39980. Its totient is φ = 39978.

The previous prime is 39971. The next prime is 39983. The reversal of 39979 is 97993.

It is a happy number.

39979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 39979 - 2³ = 39971 is a prime.

It is a Chen prime.

39979 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (39971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19989 + 19990.

It is an arithmetic number, because the mean of its divisors is an integer number (19990).

2³⁹⁹⁷⁹ is an apocalyptic number.

39979 is a deficient number, since it is larger than the sum of its proper divisors (1).

39979 is an equidigital number, since it uses as much as digits as its factorization.

39979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15309, while the sum is 37.

The square root of 39979 is about 199.9474931076. The cubic root of 39979 is about 34.1935329701.

The spelling of 39979 in words is "thirty-nine thousand, nine hundred seventy-nine".