405001231 has 4 divisors (see below), whose sum is σ = 405463912. Its totient is φ = 404538552.

The previous prime is 405001229. The next prime is 405001243. The reversal of 405001231 is 132100504.

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 405001231 - 2¹ = 405001229 is a prime.

It is a super-2 number, since 2×405001231² = 328051994223030722, 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 (405001291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230025 + ... + 231778.

It is an arithmetic number, because the mean of its divisors is an integer number (101365978).

Almost surely, 2^405001231 is an apocalyptic number.

405001231 is a deficient number, since it is larger than the sum of its proper divisors (462681).

405001231 is an equidigital number, since it uses as much as digits as its factorization.

405001231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462680.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 405001231 is about 20124.6423819158. The cubic root of 405001231 is about 739.8643719051.

Adding to 405001231 its reverse (132100504), we get a palindrome (537101735).

The spelling of 405001231 in words is "four hundred five million, one thousand, two hundred thirty-one".