345996809 has 4 divisors (see below), whose sum is σ = 346048020. Its totient is φ = 345945600.

The previous prime is 345996803. The next prime is 345996817. The reversal of 345996809 is 908699543.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 908699543 = 29 ⋅31334467.

It can be written as a sum of positive squares in 2 ways, for example, as 232105225 + 113891584 = 15235^2 + 10672^2 .

It is a cyclic number.

It is not a de Polignac number, because 345996809 - 2⁴ = 345996793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (345996803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13592 + ... + 29609.

It is an arithmetic number, because the mean of its divisors is an integer number (86512005).

Almost surely, 2^345996809 is an apocalyptic number.

It is an amenable number.

345996809 is a deficient number, since it is larger than the sum of its proper divisors (51211).

345996809 is an equidigital number, since it uses as much as digits as its factorization.

345996809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51210.

The product of its (nonzero) digits is 2099520, while the sum is 53.

The square root of 345996809 is about 18600.9894629291. The cubic root of 345996809 is about 702.0327369792.

The spelling of 345996809 in words is "three hundred forty-five million, nine hundred ninety-six thousand, eight hundred nine".