39940469 has 2 divisors, whose sum is σ = 39940470. Its totient is φ = 39940468.

The previous prime is 39940409. The next prime is 39940477. The reversal of 39940469 is 96404993.

It is a happy number.

39940469 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39062500 + 877969 = 6250^2 + 937^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39940469 is a prime.

It is a super-2 number, since 2×39940469² = 3190482127879922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39940409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19970234 + 19970235.

It is an arithmetic number, because the mean of its divisors is an integer number (19970235).

Almost surely, 2^39940469 is an apocalyptic number.

It is an amenable number.

39940469 is a deficient number, since it is larger than the sum of its proper divisors (1).

39940469 is an equidigital number, since it uses as much as digits as its factorization.

39940469 is an odious number, because the sum of its binary digits is odd.

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

The square root of 39940469 is about 6319.8472291662. The cubic root of 39940469 is about 341.8254441348.

The spelling of 39940469 in words is "thirty-nine million, nine hundred forty thousand, four hundred sixty-nine".