345420905 has 4 divisors (see below), whose sum is σ = 414505092. Its totient is φ = 276336720.

The previous prime is 345420883. The next prime is 345420913. The reversal of 345420905 is 509024543.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 100060009 + 245360896 = 10003^2 + 15664^2 .

It is a de Polignac number, because none of the positive numbers 2^k-345420905 is a prime.

It is a super-2 number, since 2×345420905² = 238631203222038050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34542086 + ... + 34542095.

It is an arithmetic number, because the mean of its divisors is an integer number (103626273).

Almost surely, 2^345420905 is an apocalyptic number.

It is an amenable number.

345420905 is a deficient number, since it is larger than the sum of its proper divisors (69084187).

345420905 is an equidigital number, since it uses as much as digits as its factorization.

345420905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69084186.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 345420905 is about 18585.5025490300. The cubic root of 345420905 is about 701.6430147077.

The spelling of 345420905 in words is "three hundred forty-five million, four hundred twenty thousand, nine hundred five".