349172779 has 4 divisors (see below), whose sum is σ = 352436184. Its totient is φ = 345909376.

The previous prime is 349172773. The next prime is 349172801. The reversal of 349172779 is 977271943.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-349172779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (349172773) 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, 1631542 + ... + 1631755.

It is an arithmetic number, because the mean of its divisors is an integer number (88109046).

Almost surely, 2^349172779 is an apocalyptic number.

349172779 is a deficient number, since it is larger than the sum of its proper divisors (3263405).

349172779 is a wasteful number, since it uses less digits than its factorization.

349172779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3263404.

The product of its digits is 666792, while the sum is 49.

The square root of 349172779 is about 18686.1654439856. The cubic root of 349172779 is about 704.1742282224.

The spelling of 349172779 in words is "three hundred forty-nine million, one hundred seventy-two thousand, seven hundred seventy-nine".