345765921 has 4 divisors (see below), whose sum is σ = 461021232. Its totient is φ = 230510612.

The previous prime is 345765863. The next prime is 345765947. The reversal of 345765921 is 129567543.

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.

It is a cyclic number.

It is not a de Polignac number, because 345765921 - 2¹⁵ = 345733153 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (345765961) 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, 57627651 + ... + 57627656.

It is an arithmetic number, because the mean of its divisors is an integer number (115255308).

Almost surely, 2^345765921 is an apocalyptic number.

It is an amenable number.

345765921 is a deficient number, since it is larger than the sum of its proper divisors (115255311).

345765921 is a wasteful number, since it uses less digits than its factorization.

345765921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115255310.

The product of its digits is 226800, while the sum is 42.

The square root of 345765921 is about 18594.7820906834. The cubic root of 345765921 is about 701.8765438210.

It can be divided in two parts, 3457 and 65921, that added together give a triangular number (69378 = T₃₇₂).

The spelling of 345765921 in words is "three hundred forty-five million, seven hundred sixty-five thousand, nine hundred twenty-one".