349128340 has 48 divisors (see below), whose sum is σ = 810815040. Its totient is φ = 125210880.

The previous prime is 349128313. The next prime is 349128341. The reversal of 349128340 is 43821943.

It is a junction number, because it is equal to n+sod(n) for n = 349128296 and 349128305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (349128341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5191 + ... + 26929.

It is an arithmetic number, because the mean of its divisors is an integer number (16891980).

Almost surely, 2^349128340 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 349128340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (405407520).

349128340 is an abundant number, since it is smaller than the sum of its proper divisors (461686700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

349128340 is a wasteful number, since it uses less digits than its factorization.

349128340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21832 (or 21830 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 349128340 is about 18684.9763178871. The cubic root of 349128340 is about 704.1443536845.

The spelling of 349128340 in words is "three hundred forty-nine million, one hundred twenty-eight thousand, three hundred forty".