1405721417 has 2 divisors, whose sum is σ = 1405721418. Its totient is φ = 1405721416.

The previous prime is 1405721389. The next prime is 1405721419. The reversal of 1405721417 is 7141275041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1347183616 + 58537801 = 36704^2 + 7651^2 .

It is a cyclic number.

It is not a de Polignac number, because 1405721417 - 2¹² = 1405717321 is a prime.

It is a super-3 number, since 3×1405721417³ (a number of 28 digits) contains 333 as substring.

Together with 1405721419, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1405721419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 702860708 + 702860709.

It is an arithmetic number, because the mean of its divisors is an integer number (702860709).

Almost surely, 2^1405721417 is an apocalyptic number.

It is an amenable number.

1405721417 is a deficient number, since it is larger than the sum of its proper divisors (1).

1405721417 is an equidigital number, since it uses as much as digits as its factorization.

1405721417 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 1405721417 is about 37492.9515642607. The cubic root of 1405721417 is about 1120.2107960483.

Adding to 1405721417 its reverse (7141275041), we get a palindrome (8546996458).

The spelling of 1405721417 in words is "one billion, four hundred five million, seven hundred twenty-one thousand, four hundred seventeen".