39925661 has 2 divisors, whose sum is σ = 39925662. Its totient is φ = 39925660.

The previous prime is 39925649. The next prime is 39925679. The reversal of 39925661 is 16652993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39816100 + 109561 = 6310^2 + 331^2 .

It is a cyclic number.

It is not a de Polignac number, because 39925661 - 2⁶ = 39925597 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39925621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19962830 + 19962831.

It is an arithmetic number, because the mean of its divisors is an integer number (19962831).

Almost surely, 2^39925661 is an apocalyptic number.

It is an amenable number.

39925661 is a deficient number, since it is larger than the sum of its proper divisors (1).

39925661 is an equidigital number, since it uses as much as digits as its factorization.

39925661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 87480, while the sum is 41.

The square root of 39925661 is about 6318.6755732511. The cubic root of 39925661 is about 341.7831947824.

The spelling of 39925661 in words is "thirty-nine million, nine hundred twenty-five thousand, six hundred sixty-one".