421604769 has 4 divisors (see below), whose sum is σ = 562139696. Its totient is φ = 281069844.

The previous prime is 421604761. The next prime is 421604779. The reversal of 421604769 is 967406124.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 421604769 - 2³ = 421604761 is a prime.

It is a super-2 number, since 2×421604769² = 355501162487086722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421604761) 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, 70267459 + ... + 70267464.

It is an arithmetic number, because the mean of its divisors is an integer number (140534924).

Almost surely, 2^421604769 is an apocalyptic number.

It is an amenable number.

421604769 is a deficient number, since it is larger than the sum of its proper divisors (140534927).

421604769 is a wasteful number, since it uses less digits than its factorization.

421604769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140534926.

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 421604769 is about 20533.0165587037. The cubic root of 421604769 is about 749.8398289072.

The spelling of 421604769 in words is "four hundred twenty-one million, six hundred four thousand, seven hundred sixty-nine".