425666 has 8 divisors (see below), whose sum is σ = 641424. Its totient is φ = 211860.

The previous prime is 425653. The next prime is 425681. The reversal of 425666 is 666524.

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

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 3 ways as a sum of consecutive naturals, for example, 341 + ... + 983.

It is an arithmetic number, because the mean of its divisors is an integer number (80178).

2⁴²⁵⁶⁶⁶ is an apocalyptic number.

425666 is a deficient number, since it is larger than the sum of its proper divisors (215758).

425666 is a wasteful number, since it uses less digits than its factorization.

425666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976.

The product of its digits is 8640, while the sum is 29.

The square root of 425666 is about 652.4308392466. The cubic root of 425666 is about 75.2239822785.

The spelling of 425666 in words is "four hundred twenty-five thousand, six hundred sixty-six".