345384721 has 16 divisors (see below), whose sum is σ = 393840000. Its totient is φ = 299819520.

The previous prime is 345384701. The next prime is 345384737. The reversal of 345384721 is 127483543.

It is a happy number.

It is not a de Polignac number, because 345384721 - 2⁷ = 345384593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (345384701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 275905 + ... + 277153.

It is an arithmetic number, because the mean of its divisors is an integer number (24615000).

Almost surely, 2^345384721 is an apocalyptic number.

It is an amenable number.

345384721 is a deficient number, since it is larger than the sum of its proper divisors (48455279).

345384721 is a wasteful number, since it uses less digits than its factorization.

345384721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2376.

The product of its digits is 80640, while the sum is 37.

The square root of 345384721 is about 18584.5290766272. The cubic root of 345384721 is about 701.6185140313.

The spelling of 345384721 in words is "three hundred forty-five million, three hundred eighty-four thousand, seven hundred twenty-one".