2136408178 has 4 divisors (see below), whose sum is σ = 3204612270. Its totient is φ = 1068204088.

The previous prime is 2136408167. The next prime is 2136408179. The reversal of 2136408178 is 8718046312.

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

It can be written as a sum of positive squares in only one way, i.e., 1078662649 + 1057745529 = 32843^2 + 32523^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 2136408178.

It is not an unprimeable number, because it can be changed into a prime (2136408179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 534102043 + ... + 534102046.

Almost surely, 2^2136408178 is an apocalyptic number.

2136408178 is a deficient number, since it is larger than the sum of its proper divisors (1068204092).

2136408178 is a wasteful number, since it uses less digits than its factorization.

2136408178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1068204091.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 2136408178 is about 46221.2957196139. The cubic root of 2136408178 is about 1287.9373679567.

The spelling of 2136408178 in words is "two billion, one hundred thirty-six million, four hundred eight thousand, one hundred seventy-eight".