669147 has 4 divisors (see below), whose sum is σ = 892200. Its totient is φ = 446096.

The previous prime is 669133. The next prime is 669167. The reversal of 669147 is 741966.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 669147 - 2¹² = 665051 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (669107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111522 + ... + 111527.

It is an arithmetic number, because the mean of its divisors is an integer number (223050).

2⁶⁶⁹¹⁴⁷ is an apocalyptic number.

669147 is a deficient number, since it is larger than the sum of its proper divisors (223053).

669147 is a wasteful number, since it uses less digits than its factorization.

669147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223052.

The product of its digits is 9072, while the sum is 33.

The square root of 669147 is about 818.0140585589. The cubic root of 669147 is about 87.4662509301.

The spelling of 669147 in words is "six hundred sixty-nine thousand, one hundred forty-seven".