421845665 has 8 divisors (see below), whose sum is σ = 506336640. Its totient is φ = 337395312.

The previous prime is 421845661. The next prime is 421845689. The reversal of 421845665 is 566548124.

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

It is a cyclic number.

It is not a de Polignac number, because 421845665 - 2² = 421845661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (421845661) 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 7 ways as a sum of consecutive naturals, for example, 21896 + ... + 36374.

It is an arithmetic number, because the mean of its divisors is an integer number (63292080).

Almost surely, 2^421845665 is an apocalyptic number.

It is an amenable number.

421845665 is a deficient number, since it is larger than the sum of its proper divisors (84490975).

421845665 is a wasteful number, since it uses less digits than its factorization.

421845665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20311.

The product of its digits is 230400, while the sum is 41.

The square root of 421845665 is about 20538.8817855306. The cubic root of 421845665 is about 749.9826158934.

The spelling of 421845665 in words is "four hundred twenty-one million, eight hundred forty-five thousand, six hundred sixty-five".