39980929 has 2 divisors, whose sum is σ = 39980930. Its totient is φ = 39980928.

The previous prime is 39980893. The next prime is 39980933. The reversal of 39980929 is 92908993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32798529 + 7182400 = 5727^2 + 2680^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39980929 is a prime.

It is not a weakly prime, because it can be changed into another prime (39980989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19990464 + 19990465.

It is an arithmetic number, because the mean of its divisors is an integer number (19990465).

Almost surely, 2^39980929 is an apocalyptic number.

It is an amenable number.

39980929 is a deficient number, since it is larger than the sum of its proper divisors (1).

39980929 is an equidigital number, since it uses as much as digits as its factorization.

39980929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 314928, while the sum is 49.

The square root of 39980929 is about 6323.0474456547. The cubic root of 39980929 is about 341.9408291098.

The spelling of 39980929 in words is "thirty-nine million, nine hundred eighty thousand, nine hundred twenty-nine".