186140021939 has 4 divisors (see below), whose sum is σ = 186140902200. Its totient is φ = 186139141680.

The previous prime is 186140021929. The next prime is 186140021957. The reversal of 186140021939 is 939120041681.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 939120041681 = 17 ⋅55242355393.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-186140021939 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 186140021939.

It is not an unprimeable number, because it can be changed into a prime (186140021929) 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, 89519 + ... + 616679.

It is an arithmetic number, because the mean of its divisors is an integer number (46535225550).

Almost surely, 2^186140021939 is an apocalyptic number.

186140021939 is a deficient number, since it is larger than the sum of its proper divisors (880261).

186140021939 is an equidigital number, since it uses as much as digits as its factorization.

186140021939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 880260.

The product of its (nonzero) digits is 93312, while the sum is 44.

The spelling of 186140021939 in words is "one hundred eighty-six billion, one hundred forty million, twenty-one thousand, nine hundred thirty-nine".