2185900139 has 4 divisors (see below), whose sum is σ = 2187132024. Its totient is φ = 2184668256.

The previous prime is 2185900133. The next prime is 2185900159. The reversal of 2185900139 is 9310095812.

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

It is a cyclic number.

It is not a de Polignac number, because 2185900139 - 2²⁰ = 2184851563 is a prime.

It is a super-3 number, since 3×2185900139³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2185900133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 613277 + ... + 616830.

It is an arithmetic number, because the mean of its divisors is an integer number (546783006).

Almost surely, 2^2185900139 is an apocalyptic number.

2185900139 is a deficient number, since it is larger than the sum of its proper divisors (1231885).

2185900139 is a wasteful number, since it uses less digits than its factorization.

2185900139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1231884.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 2185900139 is about 46753.6109728436. The cubic root of 2185900139 is about 1297.8069808973.

The spelling of 2185900139 in words is "two billion, one hundred eighty-five million, nine hundred thousand, one hundred thirty-nine".