39987097 has 2 divisors, whose sum is σ = 39987098. Its totient is φ = 39987096.

The previous prime is 39987089. The next prime is 39987107. The reversal of 39987097 is 79078993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32501401 + 7485696 = 5701^2 + 2736^2 .

It is a cyclic number.

It is not a de Polignac number, because 39987097 - 2³ = 39987089 is a prime.

It is not a weakly prime, because it can be changed into another prime (39987037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19993548 + 19993549.

It is an arithmetic number, because the mean of its divisors is an integer number (19993549).

Almost surely, 2^39987097 is an apocalyptic number.

It is an amenable number.

39987097 is a deficient number, since it is larger than the sum of its proper divisors (1).

39987097 is an equidigital number, since it uses as much as digits as its factorization.

39987097 is an evil number, because the sum of its binary digits is even.

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

The square root of 39987097 is about 6323.5351663449. The cubic root of 39987097 is about 341.9584123479.

The spelling of 39987097 in words is "thirty-nine million, nine hundred eighty-seven thousand, ninety-seven".