39678369 has 4 divisors (see below), whose sum is σ = 52904496. Its totient is φ = 26452244.

The previous prime is 39678349. The next prime is 39678383. The reversal of 39678369 is 96387693.

It is a happy number.

39678369 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96387693 = 3 ⋅32129231.

It is a cyclic number.

It is not a de Polignac number, because 39678369 - 2⁷ = 39678241 is a prime.

It is a super-2 number, since 2×39678369² = 3148745933000322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (39678329) 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 in 3 ways as a sum of consecutive naturals, for example, 6613059 + ... + 6613064.

It is an arithmetic number, because the mean of its divisors is an integer number (13226124).

Almost surely, 2^39678369 is an apocalyptic number.

It is an amenable number.

39678369 is a deficient number, since it is larger than the sum of its proper divisors (13226127).

39678369 is a wasteful number, since it uses less digits than its factorization.

39678369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13226126.

The product of its digits is 1469664, while the sum is 51.

The square root of 39678369 is about 6299.0768371246. The cubic root of 39678369 is about 341.0760860253.

The spelling of 39678369 in words is "thirty-nine million, six hundred seventy-eight thousand, three hundred sixty-nine".