39978097 has 2 divisors, whose sum is σ = 39978098. Its totient is φ = 39978096.

The previous prime is 39978083. The next prime is 39978121. The reversal of 39978097 is 79087993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37834801 + 2143296 = 6151^2 + 1464^2 .

It is an emirp because it is prime and its reverse (79087993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39978097 - 2¹¹ = 39976049 is a prime.

It is not a weakly prime, because it can be changed into another prime (39978017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19989048 + 19989049.

It is an arithmetic number, because the mean of its divisors is an integer number (19989049).

Almost surely, 2^39978097 is an apocalyptic number.

It is an amenable number.

39978097 is a deficient number, since it is larger than the sum of its proper divisors (1).

39978097 is an equidigital number, since it uses as much as digits as its factorization.

39978097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 857304, while the sum is 52.

The square root of 39978097 is about 6322.8234990390. The cubic root of 39978097 is about 341.9327552662.

The spelling of 39978097 in words is "thirty-nine million, nine hundred seventy-eight thousand, ninety-seven".