405736420579421 has 2 divisors, whose sum is σ = 405736420579422. Its totient is φ = 405736420579420.

The previous prime is 405736420579411. The next prime is 405736420579439. The reversal of 405736420579421 is 124975024637504.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 290142506944900 + 115593913634521 = 17033570^2 + 10751461^2 .

It is a cyclic number.

It is not a de Polignac number, because 405736420579421 - 2¹⁰ = 405736420578397 is a prime.

It is a super-2 number, since 2×405736420579421² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (405736420579411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202868210289710 + 202868210289711.

It is an arithmetic number, because the mean of its divisors is an integer number (202868210289711).

Almost surely, 2^{405736420579421} is an apocalyptic number.

It is an amenable number.

405736420579421 is a deficient number, since it is larger than the sum of its proper divisors (1).

405736420579421 is an equidigital number, since it uses as much as digits as its factorization.

405736420579421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 50803200, while the sum is 59.

The spelling of 405736420579421 in words is "four hundred five trillion, seven hundred thirty-six billion, four hundred twenty million, five hundred seventy-nine thousand, four hundred twenty-one".