662989 has 4 divisors (see below), whose sum is σ = 665020. Its totient is φ = 660960.

The previous prime is 662957. The next prime is 662999. The reversal of 662989 is 989266.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 562500 + 100489 = 750^2 + 317^2 .

It is a cyclic number.

It is not a de Polignac number, because 662989 - 2⁵ = 662957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (662939) 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 3 ways as a sum of consecutive naturals, for example, 402 + ... + 1219.

It is an arithmetic number, because the mean of its divisors is an integer number (166255).

2⁶⁶²⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

662989 is a deficient number, since it is larger than the sum of its proper divisors (2031).

662989 is a wasteful number, since it uses less digits than its factorization.

662989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2030.

The product of its digits is 46656, while the sum is 40.

The square root of 662989 is about 814.2413647071. The cubic root of 662989 is about 87.1971132928.

The spelling of 662989 in words is "six hundred sixty-two thousand, nine hundred eighty-nine".