345057721 has 8 divisors (see below), whose sum is σ = 365554944. Its totient is φ = 324582720.

The previous prime is 345057697. The next prime is 345057731. The reversal of 345057721 is 127750543.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 345057721 - 2⁷ = 345057593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (345057731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34896 + ... + 43678.

It is an arithmetic number, because the mean of its divisors is an integer number (45694368).

Almost surely, 2^345057721 is an apocalyptic number.

It is an amenable number.

345057721 is a deficient number, since it is larger than the sum of its proper divisors (20497223).

345057721 is a wasteful number, since it uses less digits than its factorization.

345057721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11111.

The product of its (nonzero) digits is 29400, while the sum is 34.

The square root of 345057721 is about 18575.7293531102. The cubic root of 345057721 is about 701.3970202556.

The spelling of 345057721 in words is "three hundred forty-five million, fifty-seven thousand, seven hundred twenty-one".