347678399 has 4 divisors (see below), whose sum is σ = 347758536. Its totient is φ = 347598264.

The previous prime is 347678389. The next prime is 347678437. The reversal of 347678399 is 993876743.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 347678399 - 2²⁰ = 346629823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (347678329) 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 3 ways as a sum of consecutive naturals, for example, 33164 + ... + 42369.

It is an arithmetic number, because the mean of its divisors is an integer number (86939634).

Almost surely, 2^347678399 is an apocalyptic number.

347678399 is a deficient number, since it is larger than the sum of its proper divisors (80137).

347678399 is an equidigital number, since it uses as much as digits as its factorization.

347678399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80136.

The product of its digits is 6858432, while the sum is 56.

The square root of 347678399 is about 18646.1363021941. The cubic root of 347678399 is about 703.1682232365.

The spelling of 347678399 in words is "three hundred forty-seven million, six hundred seventy-eight thousand, three hundred ninety-nine".