649945 has 8 divisors (see below), whose sum is σ = 798336. Its totient is φ = 507696.

The previous prime is 649937. The next prime is 649969. The reversal of 649945 is 549946.

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 649945 - 2³ = 649937 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1297 + ... + 1726.

It is an arithmetic number, because the mean of its divisors is an integer number (99792).

2⁶⁴⁹⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

649945 is a deficient number, since it is larger than the sum of its proper divisors (148391).

649945 is a wasteful number, since it uses less digits than its factorization.

649945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3071.

The product of its digits is 38880, while the sum is 37.

The square root of 649945 is about 806.1916645563. The cubic root of 649945 is about 86.6214672267.

Subtracting from 649945 its product of digits (38880), we obtain a triangular number (611065 = T₁₁₀₅).

Subtracting from 649945 its reverse (549946), we obtain a palindrome (99999).

The spelling of 649945 in words is "six hundred forty-nine thousand, nine hundred forty-five".