39940387 has 2 divisors, whose sum is σ = 39940388. Its totient is φ = 39940386.

The previous prime is 39940363. The next prime is 39940403. The reversal of 39940387 is 78304993.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 39940387 - 2¹⁹ = 39416099 is a prime.

It is not a weakly prime, because it can be changed into another prime (39940487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19970193 + 19970194.

It is an arithmetic number, because the mean of its divisors is an integer number (19970194).

Almost surely, 2^39940387 is an apocalyptic number.

39940387 is a deficient number, since it is larger than the sum of its proper divisors (1).

39940387 is an equidigital number, since it uses as much as digits as its factorization.

39940387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 39940387 is about 6319.8407416643. The cubic root of 39940387 is about 341.8252102058.

The spelling of 39940387 in words is "thirty-nine million, nine hundred forty thousand, three hundred eighty-seven".