39966637 has 2 divisors, whose sum is σ = 39966638. Its totient is φ = 39966636.

The previous prime is 39966613. The next prime is 39966673. The reversal of 39966637 is 73666993.

Together with next prime (39966673) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26563716 + 13402921 = 5154^2 + 3661^2 .

It is an emirp because it is prime and its reverse (73666993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39966637 - 2¹⁵ = 39933869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39961637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19983318 + 19983319.

It is an arithmetic number, because the mean of its divisors is an integer number (19983319).

Almost surely, 2^39966637 is an apocalyptic number.

It is an amenable number.

39966637 is a deficient number, since it is larger than the sum of its proper divisors (1).

39966637 is an equidigital number, since it uses as much as digits as its factorization.

39966637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1102248, while the sum is 49.

The square root of 39966637 is about 6321.9171933837. The cubic root of 39966637 is about 341.9000796751.

The spelling of 39966637 in words is "thirty-nine million, nine hundred sixty-six thousand, six hundred thirty-seven".