394808648409 has 24 divisors (see below), whose sum is σ = 654474612480. Its totient is φ = 224660979648.

The previous prime is 394808648341. The next prime is 394808648441. The reversal of 394808648409 is 904846808493.

394808648409 is a `hidden beast` number, since 3 + 94 + 80 + 8 + 64 + 8 + 409 = 666.

It is not a de Polignac number, because 394808648409 - 2²¹ = 394806551257 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (394808648449) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13095412 + ... + 13125525.

It is an arithmetic number, because the mean of its divisors is an integer number (27269775520).

Almost surely, 2^394808648409 is an apocalyptic number.

It is an amenable number.

394808648409 is a deficient number, since it is larger than the sum of its proper divisors (259665964071).

394808648409 is a wasteful number, since it uses less digits than its factorization.

394808648409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26221189 (or 26221186 counting only the distinct ones).

The product of its (nonzero) digits is 47775744, while the sum is 63.

The spelling of 394808648409 in words is "three hundred ninety-four billion, eight hundred eight million, six hundred forty-eight thousand, four hundred nine".