659945 has 24 divisors (see below), whose sum is σ = 948672. Its totient is φ = 436800.

The previous prime is 659941. The next prime is 659947. The reversal of 659945 is 549956.

659945 = 67² + 68² + ... + 131².

It is not a de Polignac number, because 659945 - 2² = 659941 is a prime.

It is a Duffinian number.

Its product of digits (48600) is a multiple of the sum of its prime divisors (100).

It is a junction number, because it is equal to n+sod(n) for n = 659899 and 659908.

It is not an unprimeable number, because it can be changed into a prime (659941) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9260 + ... + 9330.

It is an arithmetic number, because the mean of its divisors is an integer number (39528).

2⁶⁵⁹⁹⁴⁵ is an apocalyptic number.

659945 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

659945 is a deficient number, since it is larger than the sum of its proper divisors (288727).

659945 is a wasteful number, since it uses less digits than its factorization.

659945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113 (or 100 counting only the distinct ones).

The product of its digits is 48600, while the sum is 38.

The square root of 659945 is about 812.3699895983. The cubic root of 659945 is about 87.0634583480.

The spelling of 659945 in words is "six hundred fifty-nine thousand, nine hundred forty-five".