39904649 has 4 divisors (see below), whose sum is σ = 40127760. Its totient is φ = 39681540.

The previous prime is 39904643. The next prime is 39904673. The reversal of 39904649 is 94640993.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 39904649 - 2⁴ = 39904633 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (39904643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111287 + ... + 111644.

It is an arithmetic number, because the mean of its divisors is an integer number (10031940).

Almost surely, 2^39904649 is an apocalyptic number.

It is an amenable number.

39904649 is a deficient number, since it is larger than the sum of its proper divisors (223111).

39904649 is a wasteful number, since it uses less digits than its factorization.

39904649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223110.

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

The square root of 39904649 is about 6317.0126642267. The cubic root of 39904649 is about 341.7232265939.

The spelling of 39904649 in words is "thirty-nine million, nine hundred four thousand, six hundred forty-nine".