421768165 has 16 divisors (see below), whose sum is σ = 622919808. Its totient is φ = 266965056.

The previous prime is 421768163. The next prime is 421768169. The reversal of 421768165 is 561867124.

It is a cyclic number.

It is not a de Polignac number, because 421768165 - 2¹ = 421768163 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421768163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 463027 + ... + 463936.

It is an arithmetic number, because the mean of its divisors is an integer number (38932488).

Almost surely, 2^421768165 is an apocalyptic number.

It is an amenable number.

421768165 is a deficient number, since it is larger than the sum of its proper divisors (201151643).

421768165 is a wasteful number, since it uses less digits than its factorization.

421768165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 926988.

The product of its digits is 80640, while the sum is 40.

The square root of 421768165 is about 20536.9950333538. The cubic root of 421768165 is about 749.9366850255.

The spelling of 421768165 in words is "four hundred twenty-one million, seven hundred sixty-eight thousand, one hundred sixty-five".