345645021 has 8 divisors (see below), whose sum is σ = 463406944. Its totient is φ = 229156560.

The previous prime is 345645019. The next prime is 345645029. The reversal of 345645021 is 120546543.

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

It is not a de Polignac number, because 345645021 - 2¹ = 345645019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 345645021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (345645029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 317731 + ... + 318816.

It is an arithmetic number, because the mean of its divisors is an integer number (57925868).

Almost surely, 2^345645021 is an apocalyptic number.

It is an amenable number.

345645021 is a deficient number, since it is larger than the sum of its proper divisors (117761923).

345645021 is a wasteful number, since it uses less digits than its factorization.

345645021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636731.

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 345645021 is about 18591.5308944691. The cubic root of 345645021 is about 701.7947285800.

The spelling of 345645021 in words is "three hundred forty-five million, six hundred forty-five thousand, twenty-one".