347638891 has 2 divisors, whose sum is σ = 347638892. Its totient is φ = 347638890.

The previous prime is 347638883. The next prime is 347638913. The reversal of 347638891 is 198836743.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 347638891 - 2³ = 347638883 is a prime.

It is not a weakly prime, because it can be changed into another prime (347638091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 173819445 + 173819446.

It is an arithmetic number, because the mean of its divisors is an integer number (173819446).

Almost surely, 2^347638891 is an apocalyptic number.

347638891 is a deficient number, since it is larger than the sum of its proper divisors (1).

347638891 is an equidigital number, since it uses as much as digits as its factorization.

347638891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 49.

The square root of 347638891 is about 18645.0768569078. The cubic root of 347638891 is about 703.1415876804.

The spelling of 347638891 in words is "three hundred forty-seven million, six hundred thirty-eight thousand, eight hundred ninety-one".