345865821 has 16 divisors (see below), whose sum is σ = 527452800. Its totient is φ = 197480448.

The previous prime is 345865811. The next prime is 345865823. The reversal of 345865821 is 128568543.

It is not a de Polignac number, because 345865821 - 2⁷ = 345865693 is a prime.

It is a super-2 number, since 2×345865821² = 239246332272008082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (345865823) 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, 23745 + ... + 35433.

It is an arithmetic number, because the mean of its divisors is an integer number (32965800).

Almost surely, 2^345865821 is an apocalyptic number.

It is an amenable number.

345865821 is a deficient number, since it is larger than the sum of its proper divisors (181586979).

345865821 is a wasteful number, since it uses less digits than its factorization.

345865821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13108.

The product of its digits is 230400, while the sum is 42.

The square root of 345865821 is about 18597.4681341305. The cubic root of 345865821 is about 701.9441335888.

The spelling of 345865821 in words is "three hundred forty-five million, eight hundred sixty-five thousand, eight hundred twenty-one".