188136493 has 4 divisors (see below), whose sum is σ = 188178048. Its totient is φ = 188094940.

The previous prime is 188136457. The next prime is 188136539. The reversal of 188136493 is 394631881.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 188136493 - 2¹³ = 188128301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188130493) 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, 13021 + ... + 23362.

It is an arithmetic number, because the mean of its divisors is an integer number (47044512).

Almost surely, 2^188136493 is an apocalyptic number.

It is an amenable number.

188136493 is a deficient number, since it is larger than the sum of its proper divisors (41555).

188136493 is an equidigital number, since it uses as much as digits as its factorization.

188136493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41554.

The product of its digits is 124416, while the sum is 43.

The square root of 188136493 is about 13716.2856852721. The cubic root of 188136493 is about 573.0040365731.

The spelling of 188136493 in words is "one hundred eighty-eight million, one hundred thirty-six thousand, four hundred ninety-three".