669387 has 4 divisors (see below), whose sum is σ = 892520. Its totient is φ = 446256.

The previous prime is 669379. The next prime is 669391. The reversal of 669387 is 783966.

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

It is not a de Polignac number, because 669387 - 2³ = 669379 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

669387 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (669377) 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, 111562 + ... + 111567.

It is an arithmetic number, because the mean of its divisors is an integer number (223130).

2⁶⁶⁹³⁸⁷ is an apocalyptic number.

669387 is a deficient number, since it is larger than the sum of its proper divisors (223133).

669387 is a wasteful number, since it uses less digits than its factorization.

669387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223132.

The product of its digits is 54432, while the sum is 39.

The square root of 669387 is about 818.1607421528. The cubic root of 669387 is about 87.4767067248.

It can be divided in two parts, 66 and 9387, that added together give a triangular number (9453 = T₁₃₇).

The spelling of 669387 in words is "six hundred sixty-nine thousand, three hundred eighty-seven".