669415 has 8 divisors (see below), whose sum is σ = 838368. Its totient is φ = 512160.

The previous prime is 669413. The next prime is 669419. The reversal of 669415 is 514966.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 669415 - 2¹ = 669413 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 (669413) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2796 + ... + 3025.

It is an arithmetic number, because the mean of its divisors is an integer number (104796).

2⁶⁶⁹⁴¹⁵ is an apocalyptic number.

669415 is a deficient number, since it is larger than the sum of its proper divisors (168953).

669415 is a wasteful number, since it uses less digits than its factorization.

669415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5849.

The product of its digits is 6480, while the sum is 31.

The square root of 669415 is about 818.1778535257. The cubic root of 669415 is about 87.4779264048.

Subtracting from 669415 its reverse (514966), we obtain a square (154449 = 393²).

The spelling of 669415 in words is "six hundred sixty-nine thousand, four hundred fifteen".