187427993 has 2 divisors, whose sum is σ = 187427994. Its totient is φ = 187427992.

The previous prime is 187427923. The next prime is 187428029. The reversal of 187427993 is 399724781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181629529 + 5798464 = 13477^2 + 2408^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-187427993 is a prime.

It is not a weakly prime, because it can be changed into another prime (187427923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93713996 + 93713997.

It is an arithmetic number, because the mean of its divisors is an integer number (93713997).

Almost surely, 2^187427993 is an apocalyptic number.

It is an amenable number.

187427993 is a deficient number, since it is larger than the sum of its proper divisors (1).

187427993 is an equidigital number, since it uses as much as digits as its factorization.

187427993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 762048, while the sum is 50.

The square root of 187427993 is about 13690.4343612612. The cubic root of 187427993 is about 572.2838430612.

The spelling of 187427993 in words is "one hundred eighty-seven million, four hundred twenty-seven thousand, nine hundred ninety-three".