345649 has 4 divisors (see below), whose sum is σ = 347760. Its totient is φ = 343540.

The previous prime is 345647. The next prime is 345659. The reversal of 345649 is 946543.

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 345649 - 2¹ = 345647 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a d-powerful number, because it can be written as 3³ + 4² + 6⁷ + 5³ + 4⁸ + 9 .

It is a Duffinian number.

345649 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 345649.

It is not an unprimeable number, because it can be changed into a prime (345643) 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, 787 + ... + 1144.

It is an arithmetic number, because the mean of its divisors is an integer number (86940).

2³⁴⁵⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

345649 is a deficient number, since it is larger than the sum of its proper divisors (2111).

345649 is a wasteful number, since it uses less digits than its factorization.

345649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2110.

The product of its digits is 12960, while the sum is 31.

The square root of 345649 is about 587.9192121372. The cubic root of 345649 is about 70.1797421546.

The spelling of 345649 in words is "three hundred forty-five thousand, six hundred forty-nine".