39890969 has 2 divisors, whose sum is σ = 39890970. Its totient is φ = 39890968.

The previous prime is 39890951. The next prime is 39890987. The reversal of 39890969 is 96909893.

It is a balanced prime because it is at equal distance from previous prime (39890951) and next prime (39890987).

It can be written as a sum of positive squares in only one way, i.e., 28249225 + 11641744 = 5315^2 + 3412^2 .

It is an emirp because it is prime and its reverse (96909893) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39890969 - 2¹⁶ = 39825433 is a prime.

It is a super-2 number, since 2×39890969² = 3182578815517922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 39890969.

It is not a weakly prime, because it can be changed into another prime (39890989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19945484 + 19945485.

It is an arithmetic number, because the mean of its divisors is an integer number (19945485).

Almost surely, 2^39890969 is an apocalyptic number.

It is an amenable number.

39890969 is a deficient number, since it is larger than the sum of its proper divisors (1).

39890969 is an equidigital number, since it uses as much as digits as its factorization.

39890969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 944784, while the sum is 53.

The square root of 39890969 is about 6315.9297811169. The cubic root of 39890969 is about 341.6841725976.

The spelling of 39890969 in words is "thirty-nine million, eight hundred ninety thousand, nine hundred sixty-nine".