186993139 has 2 divisors, whose sum is σ = 186993140. Its totient is φ = 186993138.

The previous prime is 186993137. The next prime is 186993143. The reversal of 186993139 is 931399681.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 186993139 - 2¹ = 186993137 is a prime.

Together with 186993137, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 186993092 and 186993101.

It is not a weakly prime, because it can be changed into another prime (186993137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93496569 + 93496570.

It is an arithmetic number, because the mean of its divisors is an integer number (93496570).

Almost surely, 2^186993139 is an apocalyptic number.

186993139 is a deficient number, since it is larger than the sum of its proper divisors (1).

186993139 is an equidigital number, since it uses as much as digits as its factorization.

186993139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 314928, while the sum is 49.

The square root of 186993139 is about 13674.5434658712. The cubic root of 186993139 is about 571.8409127323.

The spelling of 186993139 in words is "one hundred eighty-six million, nine hundred ninety-three thousand, one hundred thirty-nine".