347897421 has 12 divisors (see below), whose sum is σ = 516100572. Its totient is φ = 225662976.

The previous prime is 347897357. The next prime is 347897441. The reversal of 347897421 is 124798743.

It can be written as a sum of positive squares in 2 ways, for example, as 137241225 + 210656196 = 11715^2 + 14514^2 .

It is not a de Polignac number, because 347897421 - 2⁶ = 347897357 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (347897441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 522036 + ... + 522701.

It is an arithmetic number, because the mean of its divisors is an integer number (43008381).

Almost surely, 2^347897421 is an apocalyptic number.

It is an amenable number.

347897421 is a deficient number, since it is larger than the sum of its proper divisors (168203151).

347897421 is a wasteful number, since it uses less digits than its factorization.

347897421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1044780 (or 1044777 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The square root of 347897421 is about 18652.0084977463. The cubic root of 347897421 is about 703.3158471927.

The spelling of 347897421 in words is "three hundred forty-seven million, eight hundred ninety-seven thousand, four hundred twenty-one".