659994 has 16 divisors (see below), whose sum is σ = 1327968. Its totient is φ = 218672.

The previous prime is 659983. The next prime is 659999. The reversal of 659994 is 499956.

It is a happy number.

659994 is nontrivially palindromic in base 16.

It is not an unprimeable number, because it can be changed into a prime (659999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1729 + ... + 2075.

It is an arithmetic number, because the mean of its divisors is an integer number (82998).

2⁶⁵⁹⁹⁹⁴ is an apocalyptic number.

659994 is an abundant number, since it is smaller than the sum of its proper divisors (667974).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

659994 is a wasteful number, since it uses less digits than its factorization.

659994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669.

The product of its digits is 87480, while the sum is 42.

The square root of 659994 is about 812.4001477105. The cubic root of 659994 is about 87.0656130749.

It can be divided in two parts, 659 and 994, that added together give a triangular number (1653 = T₅₇).

The spelling of 659994 in words is "six hundred fifty-nine thousand, nine hundred ninety-four".