349893991 has 8 divisors (see below), whose sum is σ = 360506304. Its totient is φ = 339413760.

The previous prime is 349893979. The next prime is 349894001. The reversal of 349893991 is 199398943.

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 349893991 - 2¹⁵ = 349861223 is a prime.

It is a super-3 number, since 3×349893991³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (349893191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27630 + ... + 38251.

It is an arithmetic number, because the mean of its divisors is an integer number (45063288).

Almost surely, 2^349893991 is an apocalyptic number.

349893991 is a deficient number, since it is larger than the sum of its proper divisors (10612313).

349893991 is a wasteful number, since it uses less digits than its factorization.

349893991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66041.

The product of its digits is 1889568, while the sum is 55.

The square root of 349893991 is about 18705.4535096052. The cubic root of 349893991 is about 704.6587158227.

The spelling of 349893991 in words is "three hundred forty-nine million, eight hundred ninety-three thousand, nine hundred ninety-one".