408928447 has 4 divisors (see below), whose sum is σ = 410557896. Its totient is φ = 407299000.

The previous prime is 408928417. The next prime is 408928451. The reversal of 408928447 is 744829804.

It is a happy number.

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 408928447 - 2²⁷ = 274710719 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 408928397 and 408928406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (408928417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 814348 + ... + 814849.

It is an arithmetic number, because the mean of its divisors is an integer number (102639474).

Almost surely, 2^408928447 is an apocalyptic number.

408928447 is a deficient number, since it is larger than the sum of its proper divisors (1629449).

408928447 is a wasteful number, since it uses less digits than its factorization.

408928447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1629448.

The product of its (nonzero) digits is 516096, while the sum is 46.

The square root of 408928447 is about 20221.9793047070. The cubic root of 408928447 is about 742.2481224959.

The spelling of 408928447 in words is "four hundred eight million, nine hundred twenty-eight thousand, four hundred forty-seven".