405664847 has 8 divisors (see below), whose sum is σ = 479604000. Its totient is φ = 335722464.

The previous prime is 405664841. The next prime is 405664879. The reversal of 405664847 is 748466504.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 405664847 - 2¹⁰ = 405663823 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 405664798 and 405664807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405664841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 998972 + ... + 999377.

It is an arithmetic number, because the mean of its divisors is an integer number (59950500).

Almost surely, 2^405664847 is an apocalyptic number.

405664847 is a deficient number, since it is larger than the sum of its proper divisors (73939153).

405664847 is a wasteful number, since it uses less digits than its factorization.

405664847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1998385.

The product of its (nonzero) digits is 645120, while the sum is 44.

The square root of 405664847 is about 20141.1232804926. The cubic root of 405664847 is about 740.2682537310.

The spelling of 405664847 in words is "four hundred five million, six hundred sixty-four thousand, eight hundred forty-seven".