405206877385 has 4 divisors (see below), whose sum is σ = 486248252868. Its totient is φ = 324165501904.

The previous prime is 405206877371. The next prime is 405206877391. The reversal of 405206877385 is 583778602504.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 118806370489 + 286400506896 = 344683^2 + 535164^2 .

It is a cyclic number.

It is not a de Polignac number, because 405206877385 - 2⁵ = 405206877353 is a prime.

It is a super-2 number, since 2×405206877385² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40520687734 + ... + 40520687743.

It is an arithmetic number, because the mean of its divisors is an integer number (121562063217).

Almost surely, 2^405206877385 is an apocalyptic number.

It is an amenable number.

405206877385 is a deficient number, since it is larger than the sum of its proper divisors (81041375483).

405206877385 is an equidigital number, since it uses as much as digits as its factorization.

405206877385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81041375482.

The product of its (nonzero) digits is 11289600, while the sum is 55.

The spelling of 405206877385 in words is "four hundred five billion, two hundred six million, eight hundred seventy-seven thousand, three hundred eighty-five".