394605918213 has 16 divisors (see below), whose sum is σ = 566691685056. Its totient is φ = 242800957440.

The previous prime is 394605918211. The next prime is 394605918269. The reversal of 394605918213 is 312819506493.

It is not a de Polignac number, because 394605918213 - 2¹ = 394605918211 is a prime.

It is a super-2 number, since 2×394605918213² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394605918211) 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 15 ways as a sum of consecutive naturals, for example, 408723 + ... + 977888.

It is an arithmetic number, because the mean of its divisors is an integer number (35418230316).

Almost surely, 2^394605918213 is an apocalyptic number.

It is an amenable number.

394605918213 is a deficient number, since it is larger than the sum of its proper divisors (172085766843).

394605918213 is a wasteful number, since it uses less digits than its factorization.

394605918213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1393924.

The product of its (nonzero) digits is 1399680, while the sum is 51.

The spelling of 394605918213 in words is "three hundred ninety-four billion, six hundred five million, nine hundred eighteen thousand, two hundred thirteen".