421665469 has 4 divisors (see below), whose sum is σ = 421915644. Its totient is φ = 421415296.

The previous prime is 421665449. The next prime is 421665473. The reversal of 421665469 is 964566124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 391525369 + 30140100 = 19787^2 + 5490^2 .

It is a cyclic number.

It is not a de Polignac number, because 421665469 - 2⁵ = 421665437 is a prime.

It is a super-2 number, since 2×421665469² = 355603535493979922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421665449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122542 + ... + 125935.

It is an arithmetic number, because the mean of its divisors is an integer number (105478911).

Almost surely, 2^421665469 is an apocalyptic number.

It is an amenable number.

421665469 is a deficient number, since it is larger than the sum of its proper divisors (250175).

421665469 is a wasteful number, since it uses less digits than its factorization.

421665469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250174.

The product of its digits is 311040, while the sum is 43.

The square root of 421665469 is about 20534.4946127242. The cubic root of 421665469 is about 749.8758129194.

The spelling of 421665469 in words is "four hundred twenty-one million, six hundred sixty-five thousand, four hundred sixty-nine".