39940961 has 2 divisors, whose sum is σ = 39940962. Its totient is φ = 39940960.

The previous prime is 39940933. The next prime is 39940981. The reversal of 39940961 is 16904993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39450961 + 490000 = 6281^2 + 700^2 .

It is a cyclic number.

It is not a de Polignac number, because 39940961 - 2⁶ = 39940897 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (39940921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19970480 + 19970481.

It is an arithmetic number, because the mean of its divisors is an integer number (19970481).

Almost surely, 2^39940961 is an apocalyptic number.

It is an amenable number.

39940961 is a deficient number, since it is larger than the sum of its proper divisors (1).

39940961 is an equidigital number, since it uses as much as digits as its factorization.

39940961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 39940961 is about 6319.8861540379. The cubic root of 39940961 is about 341.8268477023.

The spelling of 39940961 in words is "thirty-nine million, nine hundred forty thousand, nine hundred sixty-one".