423864581 has 16 divisors (see below), whose sum is σ = 500981760. Its totient is φ = 350933040.

The previous prime is 423864577. The next prime is 423864589. The reversal of 423864581 is 185468324.

It is a cyclic number.

It is not a de Polignac number, because 423864581 - 2² = 423864577 is a prime.

It is a super-2 number, since 2×423864581² = 359322366052611122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423864589) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138890 + ... + 141908.

It is an arithmetic number, because the mean of its divisors is an integer number (31311360).

Almost surely, 2^423864581 is an apocalyptic number.

It is an amenable number.

423864581 is a deficient number, since it is larger than the sum of its proper divisors (77117179).

423864581 is a wasteful number, since it uses less digits than its factorization.

423864581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3704.

The product of its digits is 184320, while the sum is 41.

The square root of 423864581 is about 20587.9717553721. The cubic root of 423864581 is about 751.1771623813.

The spelling of 423864581 in words is "four hundred twenty-three million, eight hundred sixty-four thousand, five hundred eighty-one".