349520891 has 8 divisors (see below), whose sum is σ = 353280000. Its totient is φ = 345777768.

The previous prime is 349520887. The next prime is 349520909. The reversal of 349520891 is 198025943.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 349520891 - 2² = 349520887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (349520881) 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 7 ways as a sum of consecutive naturals, for example, 42860 + ... + 50358.

It is an arithmetic number, because the mean of its divisors is an integer number (44160000).

Almost surely, 2^349520891 is an apocalyptic number.

349520891 is a deficient number, since it is larger than the sum of its proper divisors (3759109).

349520891 is a wasteful number, since it uses less digits than its factorization.

349520891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7993.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 349520891 is about 18695.4778221900. The cubic root of 349520891 is about 704.4081621528.

The spelling of 349520891 in words is "three hundred forty-nine million, five hundred twenty thousand, eight hundred ninety-one".