394564426745 has 4 divisors (see below), whose sum is σ = 473477312100. Its totient is φ = 315651541392.

The previous prime is 394564426721. The next prime is 394564426747. The reversal of 394564426745 is 547624465493.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 547624465493 = 7 ⋅78232066499.

It can be written as a sum of positive squares in 2 ways, for example, as 46195334761 + 348369091984 = 214931^2 + 590228^2 .

It is a cyclic number.

It is not a de Polignac number, because 394564426745 - 2⁸ = 394564426489 is a prime.

It is a super-2 number, since 2×394564426745² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (394564426747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39456442670 + ... + 39456442679.

It is an arithmetic number, because the mean of its divisors is an integer number (118369328025).

Almost surely, 2^394564426745 is an apocalyptic number.

It is an amenable number.

394564426745 is a deficient number, since it is larger than the sum of its proper divisors (78912885355).

394564426745 is an equidigital number, since it uses as much as digits as its factorization.

394564426745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78912885354.

The product of its digits is 87091200, while the sum is 59.

The spelling of 394564426745 in words is "three hundred ninety-four billion, five hundred sixty-four million, four hundred twenty-six thousand, seven hundred forty-five".