39661469 has 2 divisors, whose sum is σ = 39661470. Its totient is φ = 39661468.

The previous prime is 39661441. The next prime is 39661471. The reversal of 39661469 is 96416693.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34987225 + 4674244 = 5915^2 + 2162^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39661469 is a prime.

It is a super-2 number, since 2×39661469² = 3146064246475922, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 39661471, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39661409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19830734 + 19830735.

It is an arithmetic number, because the mean of its divisors is an integer number (19830735).

Almost surely, 2^39661469 is an apocalyptic number.

It is an amenable number.

39661469 is a deficient number, since it is larger than the sum of its proper divisors (1).

39661469 is an equidigital number, since it uses as much as digits as its factorization.

39661469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 44.

The square root of 39661469 is about 6297.7352278418. The cubic root of 39661469 is about 341.0276548980.

The spelling of 39661469 in words is "thirty-nine million, six hundred sixty-one thousand, four hundred sixty-nine".