39914921 has 2 divisors, whose sum is σ = 39914922. Its totient is φ = 39914920.

The previous prime is 39914911. The next prime is 39914939. The reversal of 39914921 is 12941993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21114025 + 18800896 = 4595^2 + 4336^2 .

It is an emirp because it is prime and its reverse (12941993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39914921 - 2¹⁸ = 39652777 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (39914911) 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, 19957460 + 19957461.

It is an arithmetic number, because the mean of its divisors is an integer number (19957461).

Almost surely, 2^39914921 is an apocalyptic number.

It is an amenable number.

39914921 is a deficient number, since it is larger than the sum of its proper divisors (1).

39914921 is an equidigital number, since it uses as much as digits as its factorization.

39914921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496, while the sum is 38.

The square root of 39914921 is about 6317.8256544479. The cubic root of 39914921 is about 341.7525454822.

The spelling of 39914921 in words is "thirty-nine million, nine hundred fourteen thousand, nine hundred twenty-one".