423637921 has 8 divisors (see below), whose sum is σ = 486833984. Its totient is φ = 361110960.

The previous prime is 423637919. The next prime is 423637933. The reversal of 423637921 is 129736324.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 423637921 - 2¹ = 423637919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (423637961) 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 7 ways as a sum of consecutive naturals, for example, 165915 + ... + 168448.

It is an arithmetic number, because the mean of its divisors is an integer number (60854248).

Almost surely, 2^423637921 is an apocalyptic number.

It is an amenable number.

423637921 is a deficient number, since it is larger than the sum of its proper divisors (63196063).

423637921 is a wasteful number, since it uses less digits than its factorization.

423637921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334551.

The product of its digits is 54432, while the sum is 37.

The square root of 423637921 is about 20582.4663488125. The cubic root of 423637921 is about 751.0432421143.

The spelling of 423637921 in words is "four hundred twenty-three million, six hundred thirty-seven thousand, nine hundred twenty-one".