39728761 has 2 divisors, whose sum is σ = 39728762. Its totient is φ = 39728760.

The previous prime is 39728743. The next prime is 39728783. The reversal of 39728761 is 16782793.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36000000 + 3728761 = 6000^2 + 1931^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39728761 is a prime.

It is not a weakly prime, because it can be changed into another prime (39728261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19864380 + 19864381.

It is an arithmetic number, because the mean of its divisors is an integer number (19864381).

Almost surely, 2^39728761 is an apocalyptic number.

It is an amenable number.

39728761 is a deficient number, since it is larger than the sum of its proper divisors (1).

39728761 is an equidigital number, since it uses as much as digits as its factorization.

39728761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 43.

The square root of 39728761 is about 6303.0755191414. The cubic root of 39728761 is about 341.2204151697.

The spelling of 39728761 in words is "thirty-nine million, seven hundred twenty-eight thousand, seven hundred sixty-one".