349728839809 has 4 divisors (see below), whose sum is σ = 355462099540. Its totient is φ = 343995580080.

The previous prime is 349728839777. The next prime is 349728839857. The reversal of 349728839809 is 908938827943.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31664423025 + 318064416784 = 177945^2 + 563972^2 .

It is a cyclic number.

It is not a de Polignac number, because 349728839809 - 2⁵ = 349728839777 is a prime.

It is a super-3 number, since 3×349728839809³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (349728039809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2866629774 + ... + 2866629895.

It is an arithmetic number, because the mean of its divisors is an integer number (88865524885).

Almost surely, 2^349728839809 is an apocalyptic number.

It is an amenable number.

349728839809 is a deficient number, since it is larger than the sum of its proper divisors (5733259731).

349728839809 is an equidigital number, since it uses as much as digits as its factorization.

349728839809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5733259730.

The product of its (nonzero) digits is 188116992, while the sum is 70.

The spelling of 349728839809 in words is "three hundred forty-nine billion, seven hundred twenty-eight million, eight hundred thirty-nine thousand, eight hundred nine".