349818309 has 6 divisors (see below), whose sum is σ = 505293126. Its totient is φ = 233212200.

The previous prime is 349818307. The next prime is 349818331. The reversal of 349818309 is 903818943.

It can be written as a sum of positive squares in only one way, i.e., 348867684 + 950625 = 18678^2 + 975^2 .

It is not a de Polignac number, because 349818309 - 2¹ = 349818307 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (349818307) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19434342 + ... + 19434359.

It is an arithmetic number, because the mean of its divisors is an integer number (84215521).

Almost surely, 2^349818309 is an apocalyptic number.

It is an amenable number.

349818309 is a deficient number, since it is larger than the sum of its proper divisors (155474817).

349818309 is a wasteful number, since it uses less digits than its factorization.

349818309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38868707 (or 38868704 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 349818309 is about 18703.4304072809. The cubic root of 349818309 is about 704.6079063129.

The spelling of 349818309 in words is "three hundred forty-nine million, eight hundred eighteen thousand, three hundred nine".