1421406817 has 2 divisors, whose sum is σ = 1421406818. Its totient is φ = 1421406816.

The previous prime is 1421406803. The next prime is 1421406829. The reversal of 1421406817 is 7186041241.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1114491456 + 306915361 = 33384^2 + 17519^2 .

It is a cyclic number.

It is not a de Polignac number, because 1421406817 - 2¹⁵ = 1421374049 is a prime.

It is not a weakly prime, because it can be changed into another prime (1421406887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710703408 + 710703409.

It is an arithmetic number, because the mean of its divisors is an integer number (710703409).

Almost surely, 2^1421406817 is an apocalyptic number.

It is an amenable number.

1421406817 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421406817 is an equidigital number, since it uses as much as digits as its factorization.

1421406817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 1421406817 is about 37701.5492652490. The cubic root of 1421406817 is about 1124.3619274202.

The spelling of 1421406817 in words is "one billion, four hundred twenty-one million, four hundred six thousand, eight hundred seventeen".