2139808194 has 12 divisors (see below), whose sum is σ = 4636251126. Its totient is φ = 713269392.

The previous prime is 2139808189. The next prime is 2139808199. The reversal of 2139808194 is 4918089312.

It is an interprime number because it is at equal distance from previous prime (2139808189) and next prime (2139808199).

It can be written as a sum of positive squares in only one way, i.e., 1875323025 + 264485169 = 43305^2 + 16263^2 .

It is not an unprimeable number, because it can be changed into a prime (2139808199) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 59439099 + ... + 59439134.

Almost surely, 2^2139808194 is an apocalyptic number.

2139808194 is an abundant number, since it is smaller than the sum of its proper divisors (2496442932).

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

2139808194 is a wasteful number, since it uses less digits than its factorization.

2139808194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118878241 (or 118878238 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 2139808194 is about 46258.0608542987. The cubic root of 2139808194 is about 1288.6202410057.

The spelling of 2139808194 in words is "two billion, one hundred thirty-nine million, eight hundred eight thousand, one hundred ninety-four".