669425 has 6 divisors (see below), whose sum is σ = 830118. Its totient is φ = 535520.

The previous prime is 669419. The next prime is 669433. The reversal of 669425 is 524966.

669425 = T₁₃₈ + T₁₃₉ + ... + T₁₈₇.

It can be written as a sum of positive squares in 3 ways, for example, as 1936 + 667489 = 44^2 + 817^2 .

It is a de Polignac number, because none of the positive numbers 2^k-669425 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 669391 and 669400.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 669425.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 13364 + ... + 13413.

It is an arithmetic number, because the mean of its divisors is an integer number (138353).

2⁶⁶⁹⁴²⁵ is an apocalyptic number.

It is an amenable number.

669425 is a deficient number, since it is larger than the sum of its proper divisors (160693).

669425 is a wasteful number, since it uses less digits than its factorization.

669425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26787 (or 26782 counting only the distinct ones).

The product of its digits is 12960, while the sum is 32.

The square root of 669425 is about 818.1839646436. The cubic root of 669425 is about 87.4783619965.

The spelling of 669425 in words is "six hundred sixty-nine thousand, four hundred twenty-five".