345172789 has 4 divisors (see below), whose sum is σ = 371724556. Its totient is φ = 318621024.

The previous prime is 345172783. The next prime is 345172823. The reversal of 345172789 is 987271543.

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 233172900 + 111999889 = 15270^2 + 10583^2 .

It is a cyclic number.

It is not a de Polignac number, because 345172789 - 2⁵ = 345172757 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 (345172783) 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, 13275864 + ... + 13275889.

It is an arithmetic number, because the mean of its divisors is an integer number (92931139).

Almost surely, 2^345172789 is an apocalyptic number.

It is an amenable number.

345172789 is a deficient number, since it is larger than the sum of its proper divisors (26551767).

345172789 is a wasteful number, since it uses less digits than its factorization.

345172789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26551766.

The product of its digits is 423360, while the sum is 46.

The square root of 345172789 is about 18578.8263622867. The cubic root of 345172789 is about 701.4749776307.

The spelling of 345172789 in words is "three hundred forty-five million, one hundred seventy-two thousand, seven hundred eighty-nine".