2115403866 has 24 divisors (see below), whose sum is σ = 4586066784. Its totient is φ = 704720520.

The previous prime is 2115403861. The next prime is 2115403867. The reversal of 2115403866 is 6683045112.

It is a happy number.

2115403866 is a `hidden beast` number, since 21 + 1 + 540 + 38 + 66 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 2115403866.

It is not an unprimeable number, because it can be changed into a prime (2115403861) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2190 + ... + 65081.

It is an arithmetic number, because the mean of its divisors is an integer number (191086116).

Almost surely, 2^2115403866 is an apocalyptic number.

2115403866 is an abundant number, since it is smaller than the sum of its proper divisors (2470662918).

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

2115403866 is a wasteful number, since it uses less digits than its factorization.

2115403866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69026 (or 69023 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 2115403866 is about 45993.5198261668. The cubic root of 2115403866 is about 1283.7026307893.

Adding to 2115403866 its reverse (6683045112), we get a palindrome (8798448978).

The spelling of 2115403866 in words is "two billion, one hundred fifteen million, four hundred three thousand, eight hundred sixty-six".