420340165 has 16 divisors (see below), whose sum is σ = 592048512. Its totient is φ = 280442304.

The previous prime is 420340163. The next prime is 420340171. The reversal of 420340165 is 561043024.

It is a cyclic number.

It is not a de Polignac number, because 420340165 - 2¹ = 420340163 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420340163) 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, 160999 + ... + 163588.

It is an arithmetic number, because the mean of its divisors is an integer number (37003032).

Almost surely, 2^420340165 is an apocalyptic number.

It is an amenable number.

420340165 is a deficient number, since it is larger than the sum of its proper divisors (171708347).

420340165 is a wasteful number, since it uses less digits than its factorization.

420340165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324636.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 420340165 is about 20502.1990283969. The cubic root of 420340165 is about 749.0893629158.

Adding to 420340165 its reverse (561043024), we get a palindrome (981383189).

The spelling of 420340165 in words is "four hundred twenty million, three hundred forty thousand, one hundred sixty-five".