39634979 has 2 divisors, whose sum is σ = 39634980. Its totient is φ = 39634978.

The previous prime is 39634951. The next prime is 39634981. The reversal of 39634979 is 97943693.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 39634979 - 2¹² = 39630883 is a prime.

It is a Sophie Germain prime.

Together with 39634981, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 12.

It is not a weakly prime, because it can be changed into another prime (39634919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19817489 + 19817490.

It is an arithmetic number, because the mean of its divisors is an integer number (19817490).

Almost surely, 2^39634979 is an apocalyptic number.

39634979 is a deficient number, since it is larger than the sum of its proper divisors (1).

39634979 is an equidigital number, since it uses as much as digits as its factorization.

39634979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1102248, while the sum is 50.

The square root of 39634979 is about 6295.6317395477. The cubic root of 39634979 is about 340.9517135643.

The spelling of 39634979 in words is "thirty-nine million, six hundred thirty-four thousand, nine hundred seventy-nine".