423893021 has 4 divisors (see below), whose sum is σ = 446203200. Its totient is φ = 401582844.

The previous prime is 423893017. The next prime is 423893081. The reversal of 423893021 is 120398324.

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 a cyclic number.

It is not a de Polignac number, because 423893021 - 2² = 423893017 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 (423893081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11155061 + ... + 11155098.

It is an arithmetic number, because the mean of its divisors is an integer number (111550800).

Almost surely, 2^423893021 is an apocalyptic number.

It is an amenable number.

423893021 is a deficient number, since it is larger than the sum of its proper divisors (22310179).

423893021 is a wasteful number, since it uses less digits than its factorization.

423893021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22310178.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 423893021 is about 20588.6624383421. The cubic root of 423893021 is about 751.1939625589.

The spelling of 423893021 in words is "four hundred twenty-three million, eight hundred ninety-three thousand, twenty-one".