423871665 has 32 divisors (see below), whose sum is σ = 815877120. Its totient is φ = 183570624.

The previous prime is 423871661. The next prime is 423871697. The reversal of 423871665 is 566178324.

It is not a de Polignac number, because 423871665 - 2² = 423871661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (423871661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 104239 + ... + 108228.

It is an arithmetic number, because the mean of its divisors is an integer number (25496160).

Almost surely, 2^423871665 is an apocalyptic number.

It is an amenable number.

423871665 is a deficient number, since it is larger than the sum of its proper divisors (392005455).

423871665 is a wasteful number, since it uses less digits than its factorization.

423871665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212501.

The product of its digits is 241920, while the sum is 42.

The square root of 423871665 is about 20588.1437968555. The cubic root of 423871665 is about 751.1813471372.

The spelling of 423871665 in words is "four hundred twenty-three million, eight hundred seventy-one thousand, six hundred sixty-five".