2861865405 has 96 divisors (see below), whose sum is σ = 6137452800. Its totient is φ = 1239276672.

The previous prime is 2861865397. The next prime is 2861865421. The reversal of 2861865405 is 5045681682.

2861865405 is a `hidden beast` number, since 28 + 6 + 1 + 86 + 540 + 5 = 666.

It is not a de Polignac number, because 2861865405 - 2³ = 2861865397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 336951 + ... + 345339.

It is an arithmetic number, because the mean of its divisors is an integer number (63931800).

Almost surely, 2^2861865405 is an apocalyptic number.

It is an amenable number.

2861865405 is an abundant number, since it is smaller than the sum of its proper divisors (3275587395).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2861865405 is a wasteful number, since it uses less digits than its factorization.

2861865405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8448 (or 8423 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 45.

The square root of 2861865405 is about 53496.4055334562. The cubic root of 2861865405 is about 1419.7647902755.

The spelling of 2861865405 in words is "two billion, eight hundred sixty-one million, eight hundred sixty-five thousand, four hundred five".