404749939 has 4 divisors (see below), whose sum is σ = 441545400. Its totient is φ = 367954480.

The previous prime is 404749879. The next prime is 404749979. The reversal of 404749939 is 939947404.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 404749939 - 2⁷ = 404749811 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 404749892 and 404749901.

It is not an unprimeable number, because it can be changed into a prime (404749979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18397714 + ... + 18397735.

It is an arithmetic number, because the mean of its divisors is an integer number (110386350).

Almost surely, 2^404749939 is an apocalyptic number.

404749939 is a deficient number, since it is larger than the sum of its proper divisors (36795461).

404749939 is a wasteful number, since it uses less digits than its factorization.

404749939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36795460.

The product of its (nonzero) digits is 979776, while the sum is 49.

The square root of 404749939 is about 20118.3980227055. The cubic root of 404749939 is about 739.7113184903.

The spelling of 404749939 in words is "four hundred four million, seven hundred forty-nine thousand, nine hundred thirty-nine".