345980909 has 4 divisors (see below), whose sum is σ = 346025340. Its totient is φ = 345936480.

The previous prime is 345980867. The next prime is 345980963. The reversal of 345980909 is 909089543.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 188980009 + 157000900 = 13747^2 + 12530^2 .

It is a cyclic number.

It is not a de Polignac number, because 345980909 - 2¹⁶ = 345915373 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 (345980989) 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, 7112 + ... + 27249.

It is an arithmetic number, because the mean of its divisors is an integer number (86506335).

Almost surely, 2^345980909 is an apocalyptic number.

It is an amenable number.

345980909 is a deficient number, since it is larger than the sum of its proper divisors (44431).

345980909 is a wasteful number, since it uses less digits than its factorization.

345980909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44430.

The product of its (nonzero) digits is 349920, while the sum is 47.

The square root of 345980909 is about 18600.5620614002. The cubic root of 345980909 is about 702.0219830347.

The spelling of 345980909 in words is "three hundred forty-five million, nine hundred eighty thousand, nine hundred nine".