39977 has 4 divisors (see below), whose sum is σ = 45696. Its totient is φ = 34260.

The previous prime is 39971. The next prime is 39979. The reversal of 39977 is 77993.

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: 77993 = 23 ⋅3391.

It is a cyclic number.

It is not a de Polignac number, because 39977 - 2¹⁰ = 38953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (39971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2849 + ... + 2862.

It is an arithmetic number, because the mean of its divisors is an integer number (11424).

2³⁹⁹⁷⁷ is an apocalyptic number.

It is an amenable number.

39977 is a deficient number, since it is larger than the sum of its proper divisors (5719).

39977 is an equidigital number, since it uses as much as digits as its factorization.

39977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5718.

The product of its digits is 11907, while the sum is 35.

The square root of 39977 is about 199.9424917320. The cubic root of 39977 is about 34.1929627690.

It can be divided in two parts, 3997 and 7, that added together give a palindrome (4004).

The spelling of 39977 in words is "thirty-nine thousand, nine hundred seventy-seven".