421818965 has 32 divisors (see below), whose sum is σ = 541679616. Its totient is φ = 314645760.

The previous prime is 421818959. The next prime is 421818967. The reversal of 421818965 is 569818124.

It is not a de Polignac number, because 421818965 - 2²⁶ = 354710101 is a prime.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421818967) 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, 1101164 + ... + 1101546.

It is an arithmetic number, because the mean of its divisors is an integer number (16927488).

Almost surely, 2^421818965 is an apocalyptic number.

It is an amenable number.

421818965 is a deficient number, since it is larger than the sum of its proper divisors (119860651).

421818965 is a wasteful number, since it uses less digits than its factorization.

421818965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629.

The product of its digits is 138240, while the sum is 44.

The square root of 421818965 is about 20538.2317885450. The cubic root of 421818965 is about 749.9667926038.

The spelling of 421818965 in words is "four hundred twenty-one million, eight hundred eighteen thousand, nine hundred sixty-five".