405689936887 has 2 divisors, whose sum is σ = 405689936888. Its totient is φ = 405689936886.

The previous prime is 405689936831. The next prime is 405689936891. The reversal of 405689936887 is 788639986504.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-405689936887 is a prime.

It is a super-3 number, since 3×405689936887³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (405689936087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202844968443 + 202844968444.

It is an arithmetic number, because the mean of its divisors is an integer number (202844968444).

Almost surely, 2^405689936887 is an apocalyptic number.

405689936887 is a deficient number, since it is larger than the sum of its proper divisors (1).

405689936887 is an equidigital number, since it uses as much as digits as its factorization.

405689936887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 627056640, while the sum is 73.

The spelling of 405689936887 in words is "four hundred five billion, six hundred eighty-nine million, nine hundred thirty-six thousand, eight hundred eighty-seven".