405243031 has 4 divisors (see below), whose sum is σ = 405285552. Its totient is φ = 405200512.

The previous prime is 405243029. The next prime is 405243037. The reversal of 405243031 is 130342504.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 405243031 - 2¹ = 405243029 is a prime.

It is a super-2 number, since 2×405243031² = 328443828348133922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 405242993 and 405243011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405243037) 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, 375 + ... + 28471.

It is an arithmetic number, because the mean of its divisors is an integer number (101321388).

Almost surely, 2^405243031 is an apocalyptic number.

405243031 is a deficient number, since it is larger than the sum of its proper divisors (42521).

405243031 is a wasteful number, since it uses less digits than its factorization.

405243031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42520.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 405243031 is about 20130.6490456716. The cubic root of 405243031 is about 740.0115843085.

Adding to 405243031 its reverse (130342504), we get a palindrome (535585535).

The spelling of 405243031 in words is "four hundred five million, two hundred forty-three thousand, thirty-one".