423521409 has 4 divisors (see below), whose sum is σ = 564695216. Its totient is φ = 282347604.

The previous prime is 423521407. The next prime is 423521453. The reversal of 423521409 is 904125324.

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 423521409 - 2¹ = 423521407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (423521407) 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, 70586899 + ... + 70586904.

It is an arithmetic number, because the mean of its divisors is an integer number (141173804).

Almost surely, 2^423521409 is an apocalyptic number.

It is an amenable number.

423521409 is a deficient number, since it is larger than the sum of its proper divisors (141173807).

423521409 is a wasteful number, since it uses less digits than its factorization.

423521409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141173806.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 423521409 is about 20579.6357839491. The cubic root of 423521409 is about 750.9743833324.

The spelling of 423521409 in words is "four hundred twenty-three million, five hundred twenty-one thousand, four hundred nine".