39650861 has 2 divisors, whose sum is σ = 39650862. Its totient is φ = 39650860.

The previous prime is 39650839. The next prime is 39650879. The reversal of 39650861 is 16805693.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36228361 + 3422500 = 6019^2 + 1850^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39650861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39650881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19825430 + 19825431.

It is an arithmetic number, because the mean of its divisors is an integer number (19825431).

Almost surely, 2^39650861 is an apocalyptic number.

It is an amenable number.

39650861 is a deficient number, since it is larger than the sum of its proper divisors (1).

39650861 is an equidigital number, since it uses as much as digits as its factorization.

39650861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 39650861 is about 6296.8929639942. The cubic root of 39650861 is about 340.9972480235.

The spelling of 39650861 in words is "thirty-nine million, six hundred fifty thousand, eight hundred sixty-one".