5123666 has 4 divisors (see below), whose sum is σ = 7685502. Its totient is φ = 2561832.

The previous prime is 5123639. The next prime is 5123683. The reversal of 5123666 is 6663215.

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., 3222025 + 1901641 = 1795^2 + 1379^2 .

It is a Curzon number.

It is a nialpdrome in base 14.

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 as a sum of consecutive naturals, namely, 1280915 + ... + 1280918.

Almost surely, 2^5123666 is an apocalyptic number.

5123666 is a deficient number, since it is larger than the sum of its proper divisors (2561836).

5123666 is a wasteful number, since it uses less digits than its factorization.

5123666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2561835.

The product of its digits is 6480, while the sum is 29.

The square root of 5123666 is about 2263.5516340477. The cubic root of 5123666 is about 172.3959016258.

The spelling of 5123666 in words is "five million, one hundred twenty-three thousand, six hundred sixty-six".