349890823 has 4 divisors (see below), whose sum is σ = 350176288. Its totient is φ = 349605360.

The previous prime is 349890811. The next prime is 349890847. The reversal of 349890823 is 328098943.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 328098943 = 37 ⋅8867539.

It is a cyclic number.

It is not a de Polignac number, because 349890823 - 2²¹ = 347793671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (349890223) 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, 140886 + ... + 143347.

It is an arithmetic number, because the mean of its divisors is an integer number (87544072).

Almost surely, 2^349890823 is an apocalyptic number.

349890823 is a deficient number, since it is larger than the sum of its proper divisors (285465).

349890823 is a wasteful number, since it uses less digits than its factorization.

349890823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285464.

The product of its (nonzero) digits is 373248, while the sum is 46.

The square root of 349890823 is about 18705.3688282268. The cubic root of 349890823 is about 704.6565891161.

The spelling of 349890823 in words is "three hundred forty-nine million, eight hundred ninety thousand, eight hundred twenty-three".