345678947 has 4 divisors (see below), whose sum is σ = 345724776. Its totient is φ = 345633120.

The previous prime is 345678943. The next prime is 345678967. The reversal of 345678947 is 749876543.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 749876543 = 13 ⋅57682811.

It is a cyclic number.

It is not a de Polignac number, because 345678947 - 2² = 345678943 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (345678941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8633 + ... + 27674.

It is an arithmetic number, because the mean of its divisors is an integer number (86431194).

Almost surely, 2^345678947 is an apocalyptic number.

345678947 is a deficient number, since it is larger than the sum of its proper divisors (45829).

345678947 is an equidigital number, since it uses as much as digits as its factorization.

345678947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45828.

The product of its digits is 5080320, while the sum is 53.

The square root of 345678947 is about 18592.4432767724. The cubic root of 345678947 is about 701.8176888501.

The spelling of 345678947 in words is "three hundred forty-five million, six hundred seventy-eight thousand, nine hundred forty-seven".