349139893 has 2 divisors, whose sum is σ = 349139894. Its totient is φ = 349139892.

The previous prime is 349139867. The next prime is 349139899. The reversal of 349139893 is 398931943.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 329132164 + 20007729 = 18142^2 + 4473^2 .

It is a cyclic number.

It is not a de Polignac number, because 349139893 - 2¹³ = 349131701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (349139899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 174569946 + 174569947.

It is an arithmetic number, because the mean of its divisors is an integer number (174569947).

Almost surely, 2^349139893 is an apocalyptic number.

It is an amenable number.

349139893 is a deficient number, since it is larger than the sum of its proper divisors (1).

349139893 is an equidigital number, since it uses as much as digits as its factorization.

349139893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 629856, while the sum is 49.

The square root of 349139893 is about 18685.2854674474. The cubic root of 349139893 is about 704.1521205418.

The spelling of 349139893 in words is "three hundred forty-nine million, one hundred thirty-nine thousand, eight hundred ninety-three".