318649 has 8 divisors (see below), whose sum is σ = 346880. Its totient is φ = 291600.

The previous prime is 318641. The next prime is 318653. The reversal of 318649 is 946813.

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 318649 - 2³ = 318641 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

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 318649.

It is not an unprimeable number, because it can be changed into a prime (318641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 319 + ... + 859.

It is an arithmetic number, because the mean of its divisors is an integer number (43360).

2³¹⁸⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

318649 is a deficient number, since it is larger than the sum of its proper divisors (28231).

318649 is a wasteful number, since it uses less digits than its factorization.

318649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 591.

The product of its digits is 5184, while the sum is 31.

The square root of 318649 is about 564.4900353416. The cubic root of 318649 is about 68.3026446902.

The spelling of 318649 in words is "three hundred eighteen thousand, six hundred forty-nine".