393630729409 has 4 divisors (see below), whose sum is σ = 414348136240. Its totient is φ = 372913322580.

The previous prime is 393630729407. The next prime is 393630729487. The reversal of 393630729409 is 904927036393.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 904927036393 = 353 ⋅2563532681.

It is a cyclic number.

It is not a de Polignac number, because 393630729409 - 2¹ = 393630729407 is a prime.

It is a super-2 number, since 2×393630729409² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 393630729409.

It is not an unprimeable number, because it can be changed into a prime (393630729407) 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 3 ways as a sum of consecutive naturals, for example, 10358703387 + ... + 10358703424.

It is an arithmetic number, because the mean of its divisors is an integer number (103587034060).

Almost surely, 2^393630729409 is an apocalyptic number.

It is an amenable number.

393630729409 is a deficient number, since it is larger than the sum of its proper divisors (20717406831).

393630729409 is a wasteful number, since it uses less digits than its factorization.

393630729409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20717406830.

The product of its (nonzero) digits is 6613488, while the sum is 55.

The spelling of 393630729409 in words is "three hundred ninety-three billion, six hundred thirty million, seven hundred twenty-nine thousand, four hundred nine".