405023231 has 4 divisors (see below), whose sum is σ = 409033464. Its totient is φ = 401013000.

The previous prime is 405023221. The next prime is 405023237. The reversal of 405023231 is 132320504.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 405023231 - 2⁶ = 405023167 is a prime.

It is a super-2 number, since 2×405023231² = 328087635299358722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405023237) 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, 2004965 + ... + 2005166.

It is an arithmetic number, because the mean of its divisors is an integer number (102258366).

Almost surely, 2^405023231 is an apocalyptic number.

405023231 is a deficient number, since it is larger than the sum of its proper divisors (4010233).

405023231 is a wasteful number, since it uses less digits than its factorization.

405023231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4010232.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 405023231 is about 20125.1889680569. The cubic root of 405023231 is about 739.8777683429.

Adding to 405023231 its reverse (132320504), we get a palindrome (537343735).

The spelling of 405023231 in words is "four hundred five million, twenty-three thousand, two hundred thirty-one".