349727381 has 2 divisors, whose sum is σ = 349727382. Its totient is φ = 349727380.

The previous prime is 349727377. The next prime is 349727431. The reversal of 349727381 is 183727943.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 281400625 + 68326756 = 16775^2 + 8266^2 .

It is a cyclic number.

It is not a de Polignac number, because 349727381 - 2² = 349727377 is a prime.

It is a super-2 number, since 2×349727381² = 244618482042238322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (349727341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 174863690 + 174863691.

It is an arithmetic number, because the mean of its divisors is an integer number (174863691).

Almost surely, 2^349727381 is an apocalyptic number.

It is an amenable number.

349727381 is a deficient number, since it is larger than the sum of its proper divisors (1).

349727381 is an equidigital number, since it uses as much as digits as its factorization.

349727381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254016, while the sum is 44.

The square root of 349727381 is about 18700.9994652692. Note that the first 3 decimals coincide. The cubic root of 349727381 is about 704.5468516283.

The spelling of 349727381 in words is "three hundred forty-nine million, seven hundred twenty-seven thousand, three hundred eighty-one".