394658397953 has 16 divisors (see below), whose sum is σ = 408821697024. Its totient is φ = 380585882880.

The previous prime is 394658397949. The next prime is 394658397967. The reversal of 394658397953 is 359793856493.

It is a cyclic number.

It is not a de Polignac number, because 394658397953 - 2² = 394658397949 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394658397853) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21166751 + ... + 21185387.

It is an arithmetic number, because the mean of its divisors is an integer number (25551356064).

Almost surely, 2^394658397953 is an apocalyptic number.

It is an amenable number.

394658397953 is a deficient number, since it is larger than the sum of its proper divisors (14163299071).

394658397953 is a wasteful number, since it uses less digits than its factorization.

394658397953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21032.

The product of its digits is 661348800, while the sum is 71.

The spelling of 394658397953 in words is "three hundred ninety-four billion, six hundred fifty-eight million, three hundred ninety-seven thousand, nine hundred fifty-three".