345983721 has 4 divisors (see below), whose sum is σ = 461311632. Its totient is φ = 230655812.

The previous prime is 345983713. The next prime is 345983731. The reversal of 345983721 is 127389543.

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 345983721 - 2³ = 345983713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (345983731) 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, 57663951 + ... + 57663956.

It is an arithmetic number, because the mean of its divisors is an integer number (115327908).

Almost surely, 2^345983721 is an apocalyptic number.

It is an amenable number.

345983721 is a deficient number, since it is larger than the sum of its proper divisors (115327911).

345983721 is a wasteful number, since it uses less digits than its factorization.

345983721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115327910.

The product of its digits is 181440, while the sum is 42.

The square root of 345983721 is about 18600.6376503603. The cubic root of 345983721 is about 702.0238849512.

The spelling of 345983721 in words is "three hundred forty-five million, nine hundred eighty-three thousand, seven hundred twenty-one".