405820929217 has 6 divisors (see below), whose sum is σ = 446067633074. Its totient is φ = 368928117360.

The previous prime is 405820929209. The next prime is 405820929253. The reversal of 405820929217 is 712929028504.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 220607756721 + 185213172496 = 469689^2 + 430364^2 .

It is not a de Polignac number, because 405820929217 - 2³ = 405820929209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405820929257) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1676945868 + ... + 1676946109.

Almost surely, 2^405820929217 is an apocalyptic number.

It is an amenable number.

405820929217 is a deficient number, since it is larger than the sum of its proper divisors (40246703857).

405820929217 is a wasteful number, since it uses less digits than its factorization.

405820929217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3353891999 (or 3353891988 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 49.

The spelling of 405820929217 in words is "four hundred five billion, eight hundred twenty million, nine hundred twenty-nine thousand, two hundred seventeen".