1405450421 has 2 divisors, whose sum is σ = 1405450422. Its totient is φ = 1405450420.

The previous prime is 1405450393. The next prime is 1405450477. The reversal of 1405450421 is 1240545041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1088076196 + 317374225 = 32986^2 + 17815^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1405450421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1405450021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 702725210 + 702725211.

It is an arithmetic number, because the mean of its divisors is an integer number (702725211).

Almost surely, 2^1405450421 is an apocalyptic number.

It is an amenable number.

1405450421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1405450421 is an equidigital number, since it uses as much as digits as its factorization.

1405450421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 1405450421 is about 37489.3374307949. The cubic root of 1405450421 is about 1120.1388064040.

Adding to 1405450421 its reverse (1240545041), we get a palindrome (2645995462).

The spelling of 1405450421 in words is "one billion, four hundred five million, four hundred fifty thousand, four hundred twenty-one".