39907081 has 2 divisors, whose sum is σ = 39907082. Its totient is φ = 39907080.

The previous prime is 39907079. The next prime is 39907151. The reversal of 39907081 is 18070993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27657081 + 12250000 = 5259^2 + 3500^2 .

It is a cyclic number.

It is not a de Polignac number, because 39907081 - 2¹ = 39907079 is a prime.

It is a super-2 number, since 2×39907081² = 3185150227881122, which contains 22 as substring.

Together with 39907079, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 39907081.

It is not a weakly prime, because it can be changed into another prime (39907181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19953540 + 19953541.

It is an arithmetic number, because the mean of its divisors is an integer number (19953541).

Almost surely, 2^39907081 is an apocalyptic number.

It is an amenable number.

39907081 is a deficient number, since it is larger than the sum of its proper divisors (1).

39907081 is an equidigital number, since it uses as much as digits as its factorization.

39907081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 39907081 is about 6317.2051573461. The cubic root of 39907081 is about 341.7301685921.

The spelling of 39907081 in words is "thirty-nine million, nine hundred seven thousand, eighty-one".