669427 has 8 divisors (see below), whose sum is σ = 768960. Its totient is φ = 576360.

The previous prime is 669419. The next prime is 669433. The reversal of 669427 is 724966.

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

It is a cyclic number.

It is not a de Polignac number, because 669427 - 2³ = 669419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 669392 and 669401.

It is not an unprimeable number, because it can be changed into a prime (669437) 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, 1393 + ... + 1810.

It is an arithmetic number, because the mean of its divisors is an integer number (96120).

2⁶⁶⁹⁴²⁷ is an apocalyptic number.

669427 is a deficient number, since it is larger than the sum of its proper divisors (99533).

669427 is a wasteful number, since it uses less digits than its factorization.

669427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3233.

The product of its digits is 18144, while the sum is 34.

The square root of 669427 is about 818.1851868618. The cubic root of 669427 is about 87.4784491143.

The spelling of 669427 in words is "six hundred sixty-nine thousand, four hundred twenty-seven".