1405234217 has 2 divisors, whose sum is σ = 1405234218. Its totient is φ = 1405234216.

The previous prime is 1405234189. The next prime is 1405234231. The reversal of 1405234217 is 7124325041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 885895696 + 519338521 = 29764^2 + 22789^2 .

It is an emirp because it is prime and its reverse (7124325041) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1405234217 - 2⁸ = 1405233961 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1405234217.

It is not a weakly prime, because it can be changed into another prime (1405239217) 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 as a sum of consecutive naturals, namely, 702617108 + 702617109.

It is an arithmetic number, because the mean of its divisors is an integer number (702617109).

Almost surely, 2^1405234217 is an apocalyptic number.

It is an amenable number.

1405234217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1405234217 is an equidigital number, since it uses as much as digits as its factorization.

1405234217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 1405234217 is about 37486.4537799990. The cubic root of 1405234217 is about 1120.0813655280.

Adding to 1405234217 its reverse (7124325041), we get a palindrome (8529559258).

The spelling of 1405234217 in words is "one billion, four hundred five million, two hundred thirty-four thousand, two hundred seventeen".