39806669 has 6 divisors (see below), whose sum is σ = 46305774. Its totient is φ = 34119960.

The previous prime is 39806633. The next prime is 39806677. The reversal of 39806669 is 96660893.

It can be written as a sum of positive squares in only one way, i.e., 28751044 + 11055625 = 5362^2 + 3325^2 .

It is not a de Polignac number, because 39806669 - 2¹⁶ = 39741133 is a prime.

It is a super-2 number, since 2×39806669² = 3169141793751122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39806609) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 406142 + ... + 406239.

It is an arithmetic number, because the mean of its divisors is an integer number (7717629).

Almost surely, 2^39806669 is an apocalyptic number.

It is an amenable number.

39806669 is a deficient number, since it is larger than the sum of its proper divisors (6499105).

39806669 is an equidigital number, since it uses as much as digits as its factorization.

39806669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812395 (or 812388 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 47.

The square root of 39806669 is about 6309.2526498786. The cubic root of 39806669 is about 341.4433136562.

The spelling of 39806669 in words is "thirty-nine million, eight hundred six thousand, six hundred sixty-nine".