345623609 has 4 divisors (see below), whose sum is σ = 345686016. Its totient is φ = 345561204.

The previous prime is 345623573. The next prime is 345623633. The reversal of 345623609 is 906326543.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 906326543 = 19 ⋅47701397.

It is a cyclic number.

It is not a de Polignac number, because 345623609 - 2⁸ = 345623353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (345623009) 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, 21989 + ... + 34274.

It is an arithmetic number, because the mean of its divisors is an integer number (86421504).

Almost surely, 2^345623609 is an apocalyptic number.

It is an amenable number.

345623609 is a deficient number, since it is larger than the sum of its proper divisors (62407).

345623609 is an equidigital number, since it uses as much as digits as its factorization.

345623609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62406.

The product of its (nonzero) digits is 116640, while the sum is 38.

The square root of 345623609 is about 18590.9550319503. The cubic root of 345623609 is about 701.7802366995.

The spelling of 345623609 in words is "three hundred forty-five million, six hundred twenty-three thousand, six hundred nine".