405442031 has 2 divisors, whose sum is σ = 405442032. Its totient is φ = 405442030.

The previous prime is 405442001. The next prime is 405442111. The reversal of 405442031 is 130244504.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-405442031 is a prime.

It is a super-2 number, since 2×405442031² = 328766481002809922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 405441988 and 405442006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (405442001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202721015 + 202721016.

It is an arithmetic number, because the mean of its divisors is an integer number (202721016).

Almost surely, 2^405442031 is an apocalyptic number.

405442031 is a deficient number, since it is larger than the sum of its proper divisors (1).

405442031 is an equidigital number, since it uses as much as digits as its factorization.

405442031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 405442031 is about 20135.5911509943. The cubic root of 405442031 is about 740.1326953420.

Adding to 405442031 its reverse (130244504), we get a palindrome (535686535).

The spelling of 405442031 in words is "four hundred five million, four hundred forty-two thousand, thirty-one".