427666 has 4 divisors (see below), whose sum is σ = 641502. Its totient is φ = 213832.

The previous prime is 427621. The next prime is 427681. The reversal of 427666 is 666724.

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

It can be written as a sum of positive squares in only one way, i.e., 385641 + 42025 = 621^2 + 205^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106915 + ... + 106918.

2⁴²⁷⁶⁶⁶ is an apocalyptic number.

427666 is a deficient number, since it is larger than the sum of its proper divisors (213836).

427666 is a wasteful number, since it uses less digits than its factorization.

427666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213835.

The product of its digits is 12096, while the sum is 31.

The square root of 427666 is about 653.9617725831. The cubic root of 427666 is about 75.3416120243.

The spelling of 427666 in words is "four hundred twenty-seven thousand, six hundred sixty-six".