39650921 has 2 divisors, whose sum is σ = 39650922. Its totient is φ = 39650920.

The previous prime is 39650911. The next prime is 39650927. The reversal of 39650921 is 12905693.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39438400 + 212521 = 6280^2 + 461^2 .

It is a cyclic number.

It is not a de Polignac number, because 39650921 - 2¹⁸ = 39388777 is a prime.

It is a super-2 number, since 2×39650921² = 3144391072296482, which contains 22 as substring.

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 (39650927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19825460 + 19825461.

It is an arithmetic number, because the mean of its divisors is an integer number (19825461).

Almost surely, 2^39650921 is an apocalyptic number.

It is an amenable number.

39650921 is a deficient number, since it is larger than the sum of its proper divisors (1).

39650921 is an equidigital number, since it uses as much as digits as its factorization.

39650921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 39650921 is about 6296.8977282468. The cubic root of 39650921 is about 340.9974200233.

The spelling of 39650921 in words is "thirty-nine million, six hundred fifty thousand, nine hundred twenty-one".