39928261 has 2 divisors, whose sum is σ = 39928262. Its totient is φ = 39928260.

The previous prime is 39928241. The next prime is 39928267. The reversal of 39928261 is 16282993.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27720225 + 12208036 = 5265^2 + 3494^2 .

It is an emirp because it is prime and its reverse (16282993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39928261 - 2⁹ = 39927749 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39928267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19964130 + 19964131.

It is an arithmetic number, because the mean of its divisors is an integer number (19964131).

Almost surely, 2^39928261 is an apocalyptic number.

It is an amenable number.

39928261 is a deficient number, since it is larger than the sum of its proper divisors (1).

39928261 is an equidigital number, since it uses as much as digits as its factorization.

39928261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 40.

The square root of 39928261 is about 6318.8813092192. The cubic root of 39928261 is about 341.7906137121.

The spelling of 39928261 in words is "thirty-nine million, nine hundred twenty-eight thousand, two hundred sixty-one".